Aboy's first ejaculation, spermarche, usually occurs around age more than a year after the body begins producing sperm. 12 13 14 15

A boy's first ejaculation generally occurs around age 13 a full year after the body begins producing sperm. While there is the potential for a 13 year old boy to father a child full fertility is reached between the ages of 14 and 16.

The answer would be b. it is a learned trait

Yes it is hereditary because of the penis