What is the mean of this data set? 74, 81, 77, 88 *

The correct answer would be A. gulf.

We can immediately eliminate option B and D, because rivers and straits are normally smaller than bays.

Option C wouldn't make sense either, since an estuary is not an area enclosed by land, but rather an area where streams and rivers flow into a larger body of water, like an ocean.

Ultimately, this gives the correct answer to be A. Gulf.

Let me know if this helps!