please show all explanations.

10. 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