The correct answer is B. The Gulf of California
Step-by-step explanation:
In geography, a gulf refers to an area of ocean that is almost completely surrounded by the coast; in gulfs, three sides are covered by land and the remaining side is a small opening. In the case of the Gulf of California, this is located in the Northwestern area of Mexico and to the South of California in the United States.
In terms of the map presented this is the Gul the yellow arrow is pointing to, considering the arrow is pointing to an area of sea surround by land on three sides (gulf) and this area is in the northwest of Mexico and South of California.