On April 1, Chen opens a joint bank account with Bahri and deposits $1,000. Bahri deposits $500 into the account on April 2. On May 2, Chen withdraws $750. Two days later, Bahri withdraws $600.

A) Chen has made a gift to Bahri of $100.

B) Bahri has made a gift to Chen of $500.

C) Chen has made a gift to Bahri of $600.

D) Chen has made a gift to Bahri of $1,000.

Please provide an explanation for your answer, thank you!