开车时，当透平转速升至4500rpm时，应停留5分钟，检查机组振动值。

Kim bought a total of $2.65 worth of postage stamps in four denominations. If she bought an equal number of 5-cent and 25-cent stamps and twice as many 10-cent stamps as 5-cent stamps, what is the least number of 1-cent stamps she could have bought ？（）

A．5

B．10

C．15

D．20

E．25