The correct option is C It is a skew conformation
Eclipsed conformation:
A conformation where the atoms/substituents attached on the adjacent carbons are at a minimum distance or in closest proximity with ϕ=0.
(where ϕ is the torsional angle)
In staggered conformation, ϕ=60o.
In skew conformation, ϕ=30o
In given conformer, the torsional angle is similar to 30o, so it is a skew conformer.