In Your Backyard, You Step on a Dandelion and One

Multiple Choice

In your backyard, you step on a dandelion and one of its seeds gets trapped in the tread of your shoes. The next day, you go on a long hike in the wilderness wearing the same shoes. When you step in a mud puddle, the seed sticks in the mud. The seed grows into a dandelion, but no other dandelions are present to mate with it. This is an example of

A) gene flow.
B) genetic drift.
C) natural selection.
D) sexual selection.