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b.
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Sensitivity measures how often do we positively identify what we are looking for, when we see it. That is, since we're interested in using serum cotinine level to identify smokers – it quantifies how well is our criterion doing at identifying a smoker when we encounter one.
That being said, the sensitivity is not high, that is, it's not particularly close to 1.
We can interpret the result as follows: though the criterion (150+ ng/mL of serum cotinine) serves as a somewhat good indicator for identifying smokers – it's far from doing so perfectly, thus failing to identify many smokers as such.
If failing to identify a smoker is a very bad thing, then our test is doing badly. However, if strictly identifying all smokers is not an issue, or all we care about is, say, to sample a group of smokers for the purposes of our study (which seems to be the case) – then the test may still be good enough....

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