Final answer:
Convective and orographic thunderstorms are examples of airmass thunderstorms, not supercell, frontal, or tropical thunderstorms. Orographic storms are influenced by terrain, while convective storms result from local heating and rising air.
Step-by-step explanation:
Convective and orographic thunderstorms are two examples of airmass thunderstorms, which is answer choice (a). An airmass thunderstorm is characterized by the lifting of warm, moist air within a single airmass and does not necessarily require a frontal boundary to initiate convection. Orographic thunderstorms occur when this type of air is lifted due to topographical features, such as mountains. Convective thunderstorms, on the other hand, are often the result of local heating and the rising of warm air parcels.
By contrast, supercell thunderstorms involve a rotating updraft and are associated with severe weather events such as tornadoes. Tropical thunderstorms are associated with warmer climates and can be integral to the formation of tropical cyclones, including hurricanes and typhoons. However, these are distinct phenomena and do not pertain to convective or orographic thunderstorms.