It's got to be C because none of the others relate to collaboration, but I'd say if you were unsure about this answer then the only other sensible one could be B, but I'd go with C.
Both C and D.
"will" in will be is a linking verb saying which tense it is in or indicating.
Hi ^-^
It depends on if you like the major and finis with a bachelors or a masters.
