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Which of the following trait shows only variation in expressivity?

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Which of the following trait shows only variation in expressivity?

(a) Brachydactyly

(b) Osteoporosis imperfectica

(c) Pea seed colour

(d) Polydactyly

I had been asked this question in a job interview.

Query is from Penetrance and Expressivity in chapter Regulating Gene Expression in Eukaryotes of Cytogenetics

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Right answer is (b) Osteoporosis imperfectica

For explanation I would say: In case of pea seed colour the penetrance and expressivity are both 100%. In case of brachydactyly and polydactyly the penetrance varies as well as the expressivity. But in the case on osteoporosis imperfectica it is almost 100% penetrant but the expressivity is different.

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