What causes lift

Radiation

Conduction

Water vapor

Convention

D.Convention

Explanation:

The four main mechanisms that lift the air in the atmosphere and create clouds are a) Convection; b) Convergence; c) Updraft and d) Orographic Lifting

Radiation, conduction and water vapor are not responsible for creating lift in the atmosphere.  

In convection, heat energy from sun raises the temperature of surface of the earth as it passes through the atmosphere. The air near the surface become less dense  and hence starts rising thereby creating a lift.

D. convection

Explanation:

The four main mechanisms that lift the air in the atmosphere and create clouds are a) Convection; b) Convergence; c) Updraft and d) Orographic Lifting

Radiation, conduction and water vapor are not responsible for creating lift in the atmosphere.  

In convection, heat energy from sun raises the temperature of surface of the earth as it passes through the atmosphere. The air near the surface become less dense  and hence starts rising thereby creating a lift.

Hence, option D is correct

Well you see dinosaurs are hypothesized to be extinct because one, the atmosphere today won't really let most animals become as big as long ago, two these things were giant cold blooded lizards they had some unknown properties and they were different than what we have today. We don't know much about dinosaurs. The theory of an asteroid destroying all dinosaurs is supported by many facts it is still unknown. The fact that we don't see the lizards around, and in only in myths is enough for one species to be hypothesized extinct.