why is a person being arrested given the right to remain silent? a)to avoid self-incrimination b)to prepare their statement c)to decide what to tell their lawyer d)to protect them from abuse by the police

Plz ive been stuck on this question forever. in 1753 george washington was sent on a mission to a. build a fort at the point where the allegheny and monongahela rivers form the ohio river. b. attack the french at fort duquesne. c. attack the french at fort neccessity. d. deliver a message to the french demanding that they leave the ohio river.