Answer:
a. attempt to come to power through constitutional means
Explanation:
After the failed Beer Hall Putsch, Adolph Hitler decided to attempt to come to power through constitutional means.
Adolf Hitler and his followers staged the Beer Hall Putsch in Munich,he attempted to seize power in a failed coup and was imprisoned for treason .
After been released after his five year sentence, he focus his attempt of obtaining power through constitutional means(legal) rather than his previous attempt through revolution.