下列关于氢腐蚀与氢脆的说法错误的是：（）

A.氢腐蚀指高温高压下氢与钢中的碳化合生成甲烷

B.奥氏体不锈钢可以很好地抵抗氢腐蚀

C.氢脆是指钢吸收氢而导致韧性下降的现象

D.碳素钢在500摄氏度以上的高压环境下才发生氢腐蚀

A family made a down payment of $75 and borrowed the balance on a set of encyclopedias that cost $400. The balance with interest was paid in 23 monthly payments of $16 each and a final payment of $9.
The amount of interest paid was what percent of the amount borrowed ？（）

A．6%

B．12%

C．14%

D．16%

E．20%