Simplify the expression.

begin expression . . . begin fraction . . . 6 times, x raised to the eighth power . . . over . . . 3 times, x raised to the second power . . . end fraction . . . end expression

A
begin expression . . . 2 times, x raised to the fourth power . . . end expression

B
begin expression . . . 3 times, x raised to the fourth power . . . end expression

C
begin expression . . . 2 times, x raised to the sixth power . . . end expression

D
begin expression . . . 3 times, x raised to the sixth power . . . end expression