High moisture favours the attack of which nematode?

Answer: Option B

High moisture favours the attack of Heterodera sp. nematode.
Heterodera is a genus of nematodes in the family Heteroderidae. Members of the genus are obligate parasites and different species attack different crops, often causing great economic damage.
The genus is unique among nematode genera because of the ability of the female to transform into a tough, brown, cyst that protects the eggs which have been formed within her body.