I suppose you should authorise him to do so.

The correct answer is A. pulverize.

Pulverize means to reduce something to a powder or dust. In this context, it means that the speaker believes that the person they

are speaking to should give the other person permission to do something.

B. prescribe means to give a doctor’s order for a medicine or treatment. C. detach means to separate or disconnect something. D. proscibe means to prohibit or forbid something.

In this context, none of these options make sense. The speaker is not suggesting that the

person they are speaking to should give the other person permission to take medicine, separate something, or prohibit something. They are simply suggesting that the person they are speaking to should give the other person permission to do something.