The phrase, "she never smiled" might suggest that 'she' is sad, or unhappy based on her lack of showing those emotions through a smile.
Gender determines physical strength, fertility, and decides which stereotypes you're going to face.
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I would say "Women's clothing made it difficult for them to ride the existing bicycle models."
It is never mentioned bicycle makers were not making enough money, just that they were interested in making more. We can rule that out.
No accidents were mentioned in the passage so we can instantly kick that option out.
It never speaks about the weight of bicycles being a problem, only women's fashion is a problem, so not that either.
That leaves us with option three. Having women's clothing be difficult when riding bicycles is definitely mentioned, and it is stated to be a problem. So logically it should be the answer we choose.