_____, you'll never be able to persuade him. [ ]

A. However hard may you try

B. However hard you may try

C. However you may try hard

D. Try hard however you may

甲某伤残前的工资收入为每月4000元，遭受部分残疾后不得不从事更简单的工作，月收入下降为1500元，保单规定全残给付比例为70％，并假设没有其它伤残收入来源。那么，甲某的部分伤残收入保险金为（）。

A.1050元

B.1500元

C.1750元

D.2800元