Which of the following is NOT a choke point found in the Fifth Fleet's area of responsibility?

The Malacca Strait is not considered a choke point within the Fifth Fleet's area of responsibility, which primarily encompasses the Persian Gulf, Red Sea, and surrounding regions. Choke points are critical maritime passages where naval transport can be significantly restricted or affected due to geographic constraints or political situations.

The Bosporus Strait, Hormuz Strait, and Bab el-Mandeb Strait are all vital chokepoints relevant to the Fifth Fleet. The Hormuz Strait is particularly significant because it serves as the primary exit for oil tankers from the Persian Gulf, making it a strategic point for energy transport. The Bab el-Mandeb Strait connects the Red Sea to the Gulf of Aden and is another key channel for maritime traffic between Europe and Asia. The Bosporus Strait, while not within the Fifth Fleet's immediate operational area, is crucial in a broader geopolitical context, particularly regarding NATO interests and the movement of ships into the Black Sea.

In summary, while the Malacca Strait is a critical global shipping route, it does not fall under the Fifth Fleet’s specified area of responsibility, which explains why it is the exception among the listed choke points.