Which Statement Is NOT True About Nonrandom Mating

Which statement is NOT true about nonrandom mating?

A) Inbreeding is mating between relatives more often than by chance
B) Inbreeding is a change in allele frequencies that increases the proportion of heterozygotes in the population
C) An example of positive assortative mating is when a tall man marries a tall woman
D) Assortative mating tends to cause subdivision into two phenotypic classes with reduced gene flow between them