Answer:
A.) 55/8
Explanation:
To make 6 7/8 an improper fraction, multiply the whole number by the denominator and add the result to the numerator.
That’s 
6 x 8 = 48 
48 + 7 = 55 
Also, the denominator of the mixed number still remains the denominator of the improper fraction.
That’s 
55/8