Which statement best describes the age of the seafloor?
a. it is constant throughout the world.
b. it is younger near the center and older near the continents.
c. it is older near the center and younger near the continents.
d. the seafloor is the newest landform on earth.

The correct option is B. The newest crust on earth is located at the actual site of the floor spreading and as new crusts are formed they replace it. Thus, the older the crust the farther it is from the mid ocean ridge. 
Sea floor spreading is a geological process in which tectonic plates splits apart from one another. It occurs at divergent plate boundaries.