Which of the Following Is an Example of Selection Producing

Which of the following is an example of selection producing complex evolutionary changes in a remarkably short period of time?

A) Using artificial selection, people intentionally caused dairy cattle, which varied in their milk production, to produce the maximum amount genetically possible.
B) A study of fish from the genus Poeciliopsis shows that short generation times allowed three different types of placenta to evolve in less than 2.4 million years.
C) Richard Dawkins was able to produce most of one of Shakespeare's sonnets using only trained monkeys and small candies as rewards.
D) The fossil record indicates that the human brain took 2 million years to double in size.