What occurred in the population from 1800 to 1925?

C. The population crashed.

Explanation: It is explained through the fact that there was a constant decreasing rate up until about 1925, to which the rate started to increase.

the transfer for conduction is the heat transfering from the liquid to the spoon

the transfer for convection is the heat rising from the liquid to the air

the transfer for radiation is the heat going through the sides of the cup and to the air

at least that is what i would do

yes? sounds right, but you didn’t ask a question.