Why is it dangerous to pump the throttle for engine start in cold weather?

Question

Question PPL(A) - Private Pilot License - Operational Procedure

QuizVDS · Accepted Answer

It may cause a carburettor fire

QuizVDS · Answer

Carburettor icing can occur

QuizVDS · Answer

The engine might start with not enough power

QuizVDS · Answer

The oil will become diluted

PPL(A) EN - Id 8 - Why is it dangerous to pump the throttle for engine start in cold weather?