The Songs of Male Cowbirds Reared in Isolation from Male

The songs of male cowbirds reared in isolation from male conspecifics are substantially more appealing to female cowbirds than are the songs of males reared in groups. Additional observation revealed that when they were individually introduced into an aviary with an established colony of cowbirds,

A) group reared males had a more rapid rate of song development than isolates.
B) group reared males were attacked and sometimes killed by resident dominant males.
C) isolate males kept a low profile in their new environment and, thus, came into contact with females more frequently.
D) isolate males repeatedly sang high-potency songs in the presence of dominant males.