Adepositional feature that forms where a stream enters a lake or an ocean is a
a. natural levee.
b. meander.
c. delta.
d. distributary.

C. delta.

Explanation:

The delta is the landform that is formed by the process of deposition of sediments that are carried by the free flowing rivers from landforms. The delta forms when the river enters into the sea, lake, estuary, ocean, reservoir  and also forms when the another kind of river cannot carry away the already deposited sediments from delta.

that is wrong, its not thymus.