Identify the correct statements regarding the major disadvantage of external fertilization:
(a) The offspring are extremely vulnerable to predators threatening their survival up to adulthood.
(b) The sperms may not meet the egg.
(c) A large quantity of gametes is wasted. 

• A

  a and b only

• B

  b and c only

• C

  c and a only

• D

  a, b, and c