Which is NOT a problem for those governments which have injected huge money into their eco

Which is NOT a problem for those governments which have injected huge money into their economies？

A．When to avoid a repeat of the financial crisis.

B．When to withdraw that support without harming a recovery.

C．How to withdraw that support without harming a recovery.

D．How to avoid a repeat of the financial crisis.

请帮忙给出正确答案和分析，谢谢！