A) \(\mathrm{NO} \mathrm{CHANGE}\) B) however, C) for example, D) DELETE the underlined portion.

Proper understanding of grammar rules is crucial for doing well in the SAT Writing and Language Section. Grammar encompasses a vast array of topics including parts of speech, tense, subject-verb agreement, and punctuation. For instance, when determining the correct conjunction to use in a complex sentence, knowledge of coordinating and subordinating conjunctions is necessary.

Use punctuation marks like commas and semicolons accurately, especially when considering options like 'however,' which often requires a comma when used to connect two independent clauses. Remember to keep an eye out for common mistakes, such as improper pronoun usage and run-on sentences. Breaking down each underlined portion of a test question and verifying its grammaticality will greatly increase the likelihood of choosing the correct answer.

Sentence structure is another pillar in the SAT Writing and Language Section. As demonstrated in the exercise, you must be able to identify the main parts of a sentence and understand how they fit together to convey a clear meaning. An important aspect of sentence structure is the ability to recognize different types of clauses and how they should be connected.

Consequently, knowing when to use connectors like 'however' or phrase introducers such as 'for example,' is vital. These cues help in creating complex, yet coherent sentences that enhance the efficacy of the written message. Always consider the sentence’s flow and clarity, making adroit decisions about what to include or omit, in order to achieve a concise and fluent writing style.

When it comes to test preparation strategies for the SAT Writing and Language Section, practice is key. Begin by familiarizing yourself with the types of questions that appear on the test and the common grammar rules and sentence structures they assess.

To build confidence, practice with sample questions and full-length practice tests under timed conditions. This will not only improve your speed but also help you learn to quickly identify errors and choose the correct revisions for sentences.

Review Your Mistakes

After completing practice questions, review your incorrect answers to understand where you went wrong. Learning from your mistakes and understanding the rationale behind the correct answers will prepare you better for the actual test.

Utilize Study Materials and Resources

Take advantage of study guides, resource books, and online platforms like the one providing this exercise. They offer thorough explanations, exercises, and strategies to conquer the SAT Writing and Language Section. Combining these materials with regular practice can make an immense difference in your test performances.