Which strain of feminism argues that there are biological differences between men and women and that these differences should be appreciated?

The correct answer is - cultural feminism.

Explanation:

Cultural feminism is a type of feminism in which the people that have the ideology of "female nature" that attempts to redefine characters that ascribed females or undervalue the females.  

These groups of people of feminism consider differences that are innate in between men and women and these should be considered the valid facts. These are the feminist strain that consider females less on their cultural and biological differences.

Thus, the correct answer is - cultural feminism.