Charlemagne briefly reunited much of western europe by a. ceasing war with his enemies after calling upon the pope's support. b. compiling the corpus juris civilis to reform laws within his empire. c. sending out missi dominici to keep control over his provincial rulers. d. bringing back missionaries from asia to strengthen belief at his court.

The correct answer is A.

Charlemagne briefly reunited much of Western Europe by ceasing war with his enemies after calling upon the Pope's support.
He was known by the Pope as the Emperor of Romans which brought Christians back and helped reunites the Western Europe.  

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.