Which statements describe similarities between the art of Georgia O'Keeffe and Edward Weston?

There is more than one possible answer

A. they are examples of modernism and are often close-up of natural objects.

B. Light and dark values in them help show an object's form.

C. The objects in them are depicted in the center in order to craate variety.

D. They are abstract, with simplified lined and shapes

I think that is C one correct answer but I'm pretty sure there are more.