The 3rd one.

The part in bold is what Murray suggests. Actually, his position regarding the rise of births.

The red parts are what he didn't account for.

From this B is the answer.

the others are not mentioned clearly in the passage.

Hope this helps.

Regards

PS: reead super very careful. All the information are contained in the passage.

Option A says that he ignored the role women play in dual-income households.' This is incorrect as not all the women of that society played a role in dual-income households. Some women played that role. He did not ignore consciously but he did not mention that because his oversight was not complete, it was partial.
Option B says that he failed to account for a particular segment of society This is correct as he did not consider the lower or lower-middle-income women who were living in dual-income households.
Option C might be correct but the passage didn't mention it, rather the passage indicated that there were some women who played dual-income households.
Option D is incorrect as he didn't emphasize the women who were working in the factories.
Option E is incorrect as he didn't only consider the women's perspective, rather he considered both men's and women's perspectives.

Answer to the question No. 2 is credible.
Plausible means credible, reasonable, and logical.

Option A is not correct because acceptable may not be always logical. Here the final sentence of the passage is both logical and acceptable. So A can not be the option.
Option B is not correct because which is common may not be logical.
Option C is correct as credible means logical.
Option D is not correct as praiseworthy means complementation to someone which does not convey the idea of being logical.
Option E is incorrect as controversial and logical are two different things. Controversial is a negative word but there is no negative logic in the last sentence.
So the correct answer is Option C, credible.