If the conditional statement “If you live in Boise, then you live in Idaho,” is true, then which other statement must be true?

A. If you do not live in Idaho, then you live in Boise.
B. If you do not live in Boise, then you do not live in Idaho.
C. If you do not live in Idaho, then you do not live in Boise.
D. If you live in Idaho, then you live in Boise.