Which type of discrimination is challenged by the fight to legalize same-sex marriage and provide a gender-neutral marriage definition in human rights legislation?

A) sexism
B) heterosexism
C) classism
D) ageism

Heterosexism

The belief in the natural superiority of heterosexuality as a way of life and therefore its logical right to dominance. Comprised of a system of ideas and institutionalized beliefs, it leads to the oppression of any non-heterosexual form of behaviour, identity, relationship, or community.

Same-sex Marriage

The legally or socially recognized marriage between two individuals of the same biological sex or gender identity.

Gender-neutral

Pertains to language or practices that avoid distinguishing roles or attributes according to people's sex or gender, promoting equality.