A Beaker of Water Is Placed on a Bunsen Burner

Multiple Choice

A beaker of water is placed on a Bunsen burner.As the lower layers of water are heated,they become less dense and rise.This permits cooler layers to move downward and be heated.Eventually,the water boils.Which method(s) of heat transfer is (are) primarily responsible for boiling the sample?

A) conduction
B) convection
C) radiation
D) both conduction and radiation
E) both conduction and convection