Wanting to buy an mp3 player but waiting until you have the cash (rather than buying on credit) is a- mature
b. responsible
c. both mature and responsible
d. neither responsible nor mature

Wanting to buy an mp3 player but waiting until you have the cash (rather than buying on credit) is both mature and responsible

Explanation:

When a person is going to acquire any kind of good that has an elevated cost, it is a demonstration of maturity and responsibility to better buy it in cash instead of asking for a credit since this keeps the person away from unnecessary debt that could become a problem if the person does not have the economic stability to afford the payments.

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