Hi! Your answer would be
a. is correct, becuase it's future progressive
b. is wrong, but close. It's f<span>uture perfect progressive tense</span>
c. is wrong because it's present, not future progressive.
d. is wrong because it's past.
Hoped I helped!
Answer: death.
Explanation:
your heart would stop pumping blood to the body
B, it tells how long the tree takes to grow
or
c, this answer tells how long the acorns take to grow therefore making half-grown acorns