According to a 1996 survey by the National Association of College and University Business Officers, more than three times as many independent institutions of higher education charge tuition and fees of under $8,000 a year than those that charge over $16,000.

(A) than those that charge (B) than are charging (C) than to charge (D) as charge (E) as those charging

(D) as charge

Step-by-step explanation:

Given statement is -

More than three times as many independent institutions of higher education charge tuition and fees of under $8,000 a year than those that charge over $16,000.

(A) than those that charge

(B) than are charging

(C) than to charge

(D) as charge

(E) as those charging

Answer is option D: "three times as many institutions charge tuition and fees of under $8,000 a year as charge over $16,000."

This option has the correct verb form and it does not include any non-parallel words.