On March 15, 2021, Jack Company purchased $5,000 of merchandise on credit subject to terms 3/10, n/20. The periodic inventory system is used. If Jack pays for these goods on March 23, 2021, the entry made to record the payment should include which of the following?

(a) 4,850 credit to accounts payable

(b) $4,850 debit to cash

(c) $150 credit to purchase discount

(d) $5,000 debit to accounts payable

p.s. I already know that the answer is c however, I don't understand why, please include an explanation.