Which type of air mass is associated with warm and humid conditions?

The type of air mass that is associated with warm and humid conditions is indeed Maritime Tropical. This air mass originates over warm ocean waters, which allows it to absorb moisture and heat. As a result, Maritime Tropical air masses are characterized by high humidity and moderate to warm temperatures. They typically influence weather patterns, especially in coastal areas and during the warmer months, leading to conditions that can result in thunderstorms and increased precipitation.

In contrast, Continental Polar air masses are cold and dry because they form over land in polar regions, and Continental Tropical air masses, though warm, are also dry since they originate over land in warmer latitudes. Maritime Polar air masses, on the other hand, bring cool and moist conditions but do not contribute to warm temperatures. Thus, Maritime Tropical is distinct in its combination of warmth and humidity, making it the correct choice for this question.