What Evidence Do Molecular Biologists Use to Infer That a Gene

What evidence do molecular biologists use to infer that a gene is part of a gene family?

A) Its sequence is almost exactly identical to that of a gene in another organism.
B) Its structure (meaning its pattern of exons and introns) is identical to that of a gene found in another species.
C) Its composition, in terms of percentage of A-T and G-C pairs, is unique.
D) Its sequence, structure, and composition are similar to those of another gene in the same genome.