To Conclude That the Clark's Nutcracker Is a Mutualistic Seed

To conclude that the Clark's nutcracker is a mutualistic seed disperser,not just a predator,you would need to determine that

A) if the birds are not present,whitebark pine cannot spread.
B) the birds eat all the seeds they cache.
C) seeds in the caches can germinate to produce seedlings.
D) bears and squirrels do not eat any of the seeds.