16. In the current year, Alliance Corporation made contributions totaling $200,000 to qualified charitable organizations. Due to the 10% limit, it could only deduct $150,000 of the contributions on its return. Which of the following statements is true regarding the excess contributions of $50,000?

a. Charitable contributions in excess of the limit may, subject to limitations, be carried back to each of the 3 prior years.

b. Charitable contributions in excess of the 10% limit may be allowed in the current year under special circumstances.

c. Charitable contributions in excess of the limit may, subject to limitations, be carried over to each of the following 5 years.

d. Charitable contributions in excess of the limit may, subject to limitations, be carried over to each of the following 20 years.