Which process may result in an inversion layer at about 5000 ft (1500 m) height?

Question

PPL(A) English - Private Pilot License - Meteorology - Which process may result in an inversion layer at about 5000 ft (1500 m) height?

QuizVDS · Accepted Answer

Widespread descending air within a high pressure area

QuizVDS · Answer

Intensive sunlight insolation during a warm summer day

QuizVDS · Answer

Ground cooling by radiation during the night

QuizVDS · Answer

Advection of cool air in the upper troposphere

PPL(A) EN: Which process may result in an inversion layer at about 5000 ft (1500 m) height?