Feeling comfortable with one's femaleness or maleness is part of which domain of identity development?

A) ethnic
B) gender
C) religious
D) political

Gender

The range of characteristics pertaining to, and differentiating between, masculinity and femininity, including social roles, behaviors, and identities beyond biological sex.

Identity Development

The process through which individuals come to understand and define themselves, often involving exploration of personal, social, and cultural identities.