If the numbers 15 and 21 are interchanged, then which of the following equations will be correctly balanced?

A

$$62 \div 31 - 21 + 15 \times 3 = 80$$

B

$$63 \div 15 + 21 \times 5 - 4 = 74$$

C

$$26 + 21 \times 15 \div 3 - 14 = 108$$

D

$$24 - 21 \div 3 + 15 - 7 = 23$$