What Two Reasons Were Given for Why Massed Studying Is

What two reasons were given for why massed studying is NOT a very effective studying technique?

A) Massed studying doesn't allow consolidation and it takes longer than spaced studying.
B) The brain can't process too much information at once and it uses more energy than spaced studying.
C) It doesn't allow enough time between learning trials to maximize learning and it leads to sleep deprivation compared to spaced studying.
D) It forces the learned material to become associated with a specific context and the learning doesn't last as long as spaced studying.