-Refer to the Information Above

-Refer to the information above.If the wage rate falls from $7 to $6,the marginal cost of increasing output from 45 units to 90 units

A) remains constant at 31 cents.
B) decreases to 13 cents.
C) remains constant at 37 cents.
D) decreases to 27 cents.
E) decreases to 18 cents.