How does meiosis affect the variation in the offspring of this cross?

a
Meiosis causes alleles to assort in pairs, creating less variety of traits in the offspring.
b
Meiosis causes alleles to assort in pairs, creating a greater variety of traits in the offspring.
c
Meiosis causes alleles to assort independently, creating less variety of traits in the offspring.
d
Meiosis causes alleles to assort independently, creating a greater variety of traits in the offspring.

d) Meiosis causes alleles to assort independently, creating a greater variety of traits in the offspring.