Which of the following statements is true?

A) Groups that achieve diversity by including people who vary in their skill level outperform groups comprised of all highly skilled members.
B) All female groups tend to outperform all male groups.
C) The lone man or woman in an otherwise homogeneously gendered group is often subjected to greater scrutiny than other group members.
D) Adding a single woman to otherwise all-male groups undermines the group's performance on masculine-type tasks,such as wilderness survival games.