Which of these statements about the life of oliver cromwell is true?
a. after winning the english civil war, cromwell appointed himself lord protector and took on many of the monarch’s powers.
b. cromwell was in favor of sparing the life of charles i as long the king agreed to leave england and go into exile.
c. cromwell led a brutal invasion of ireland and treated his opponents in england harshly by suppressing them.
d. cromwell dissolved the position of lord protector before his death so that others could not exploit it in the future.

I am not completely sure about the answer. But let's say that B is not correct because he felt very strongly about executing Charles and thought that was the only way to save the country. And D is also incorrect, because his son succeeded him as Lord Protector. I also think that A may be incorrect, because following the English Civil War, there was a time of Commonwealth of England, and then Cromwell was appointed Lord Protector, but he didn't do so himself, his fellow leaders invited him to do so.
So finally, in my opinion, the correct answer is C - because a great number was killed during the invasion of Ireland, he killed them all ruthlessly.