Find the LCD of the pair of expressions.

8/5b; 12/7b^3c

A) 7b^3c

B) 12b^3c^2

C) 35b^3c^2

D) '35b^3c

The correct answer is D.

The LCD, least common denominator, is the smallest denominator that both denominators will go into. The LCD of 5 and 7 will be 35; the variable portion will be b³c, since that is the smallest thing the second fraction can go into.

This gives us a denominator of 35b³c.