A company receives £500 of cash as an additional investment in the company by its owner, Mary Smith. The company's Cash account is increased and Mary Smith, Capital is increased. Should the £500 entry to the Cash account and to Mary Smith, Capital be a debit or a credit, respectively?
选项：

A:a debit; a debit;
B:a debit; a credit ;
C:a credit; a debit;
D:a credit; a credit