Why the Gap Between What Parents Feel They Should Do

Why the gap between what parents feel they should do and what they actually do when it comes to talking to their children about sex?

A) Many parents want to wait until the child is old enough to understand terminology.
B) Few parents have time to sit down with their children due to busy schedules.
C) Many parents feel unsure that they possess adequate and correct knowledge.
D) Few parents think it is important to talk to their children.