Because the speed of ultrasound in bone is about twice the speed in soft tissue, the distance to a structure that lies beyond a bone can be measured incorrectly. If a beam passes through $\mathbf{4}\mathbf{}\mathit{c}\mathit{m}$of tissue, then $\mathbf{2}\mathbf{}\mathit{c}\mathit{m}$of bone, and then another $\mathbf{1}\mathbf{}\mathit{c}\mathit{m}$of tissue before echoing off a cyst and returning to the transducer, what is the difference between the true distance to the cyst and the distance that is measured by assuming the speed is always $\mathbf{1540}\mathbf{}\mathit{m}\mathbf{/}\mathit{s}$? Compared with the measured distance, the structure is actually

(a) $\mathbf{1}\mathit{c}\mathit{m}$farther

(b) $\mathbf{2}\mathbf{}\mathit{c}\mathit{m}$farther

(c) $\mathbf{1}\mathbf{}\mathit{c}\mathit{m}$closer

(d) $\mathbf{2}\mathbf{}\mathit{c}\mathit{m}$closer

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