Mathew's Colleagues Used to Tease Him for His Same-Sex Attraction

Mathew's colleagues used to tease him for his same-sex attraction.However Tyler,Mathew's friend,got them to stop by making them understand the commonality and wide acceptance of homosexuality.He also told them that Mathew's preferences are likely to change over the years and hence they must not stamp him as a gay personalty.Which of the following sexual orientation models is Tyler referring to here?

A) dichotomy model
B) two dimensional model
C) unidimensional model
D) relativity model