Answer:
A I can use 8 because 4*2 =8
C I can use 16 because 4*4 = 16 and 2*16 = 16
D I can use 24 because 6*4 =24 and 3*8 =24
Explanation:
1/4 and 1/8
The multiples of 4
4,8,12,16,20,24
The multiples of 8
8,16,24,32
The first multiple that 4 and 8 have in common is 8 so that is the least common denominator
But 16 and 24 are also multiples so they are also common denominators of 4 and 8. ( They are not the least common multiple)