Feeling humiliated and frustrated, he could no longer brook the indifferent attitude of the government.

The correct answer is D. tolerate.

To tolerate something means to accept it or put up with it, even though you do not like it or agree with it. In this case,

the man is feeling humiliated and frustrated by the government’s indifferent attitude. He can no longer accept or put up with it, and he is about to take action.

The other options are not correct because they do not mean the same thing as tolerate.

• Suffer means to experience pain or distress.
• Support means to give help or encouragement.
• Condone means to forgive or overlook a wrong.

I hope this helps! Let me know if you have any other questions.