Polonius believes hamlet has gone mad because ophelia no longer returns his love. relying on what you learned in act i, select other possible reasons for hamlet's strange appearance and behavior in scene ii of act ii. select all that apply.

a. hamlet has said that he may at times pretend to be mad.
b. his uncertainties about his mother's loyalties make him test ophelia's as well.
c. the ghost has frightened him.
d. polonius's constant chatter makes him angry.