Which of the Following Demonstrates a Recent Shift in Gender

Which of the following demonstrates a recent shift in gender roles in the United States?

A) Women have recently been given the right to vote in national elections.
B) As compared with men,women earn higher college grades and more college degrees and show equal competence in STEM-related activities.
C) Women are less likely to work outside the home today than they were in the past.
D) Women typically work in fields to gather food while men herd livestock.