Which of the following air masses can lead to precipitation in a tropical region?

The maritime tropical air mass is the correct answer as it is characterized by warm, moist air that originates over large bodies of water, typically in warm tropical regions. When this air mass moves over land, it can bring significant moisture which can condense and result in precipitation. This is particularly influential in tropical areas where high temperatures can enhance the lifting of the moist air, leading to convective thunderstorms and various types of precipitation.

In contrast, the other air masses listed do not typically contribute to precipitation in tropical regions. Continental polar air masses are cold and dry, originating over land in polar regions, and thus do not bring moisture. Continental tropical air masses are warm and dry, formed over land in warm regions, and they also lack moisture necessary to produce significant precipitation. Continental Antarctic air masses are extremely cold and dry, coming from polar regions and are not associated with the warmth needed for tropical precipitation.