Kay turned 70 on March 17^th of this year. Her profit-sharing year-end account balance was $500,000 for last year. Assume that the life expectancy factor based on the uniform lifetime table for someone who is 70, 71, and 72, is 27.4, 26.5, and 25.6, respectively. What is Kays required minimum distribution (RMD) for this year?

a. $18,248

b. $18,868

c. $20,073

d. $20,755