How are seats in the House of Representatives apportioned?

Responses

by the size of the state's territory
by the size of the state's territory

by the Senate's decision
by the Senate's decision

by political party
by political party

by the size of the state's population
by the size of the state's population

The seats in the House of Representatives are apportioned by the size of the state's population according to the most recent Census data.