Final answer:
Men's contribution to child care duties from 1965 to 2011 is approximately two-thirds of what their partners contribute, indicating women still shoulder the majority of these responsibilities.
Step-by-step explanation:
The question asks to identify to what degree men's contribution to child care duties compensates compared to their partners' contribution.
The time men have dedicated to child care tripled from 1965 to 2011. Even with this increase, men's contribution is still approximately one-third of what their partners are doing, meaning the correct answer is (d) Two-thirds. This suggests that despite the significant increase in men's participation over the years, women are still taking on the bulk of child care responsibilities.