Answer:
d. There are allocation trade-offs between fecundity and other traits.
Step-by-step explanation:
for lower-than-expected fecundity , despite increased fitness is plausible because there are allocation fecundity and other traits.
Fecundity is nothing but the ability of an organism to produce and abundance of off-spring. It is same as fertility. Fecundity also depends upon size of the organism. This is called allocation fecundity.
Hence, option d is correct.