Why Are Nature Reserves That Are More Circular More Likely

Why are nature reserves that are more circular more likely to be preferred than nature reserves that are more oval in shape?

A) Oval-shaped nature reserves act more like corridors; thus, species are less likely to reside in them as compared to circular-shaped nature reserves.
B) Oval-shaped nature reserves have more edge and less interior than do more circular-shaped nature reserves; thus, oval-shaped nature reserves will favor edge species.
C) In circular-shaped nature reserves, edge species are all equidistant to the center of the reserve.
D) There is no difference between oval-shaped and circular-shaped nature reserves based solely on their geometric shape.