Confirmation That the S Gene Was Responsible for Self-Incompatibility Came

Multiple Choice

Confirmation that the S gene was responsible for self-incompatibility came from

A) overexpression of a plant's usual allele of the S gene.
B) expression of a foreign S gene.
C) homologous recombination knocking out expression of the S gene.
D) microarrays showing expression patterns of the S gene.
E) RT-PCR showing expression patterns of the S gene.