What Best Describes the Headwaters of a Drainage Basin

What best describes the headwaters of a drainage basin?

A) collection of small channels in the upper part of a basin that merge into larger streams.
B) collection of streams that empty into a body of water.
C) those parts of a drainage basin where water infiltrates into the groundwater system.
D) those parts of a drainage basin where groundwater discharge into streams.
E) those parts of a drainage basin that lie above base level.