Due to the fact that __________, pen and ink drawings like Picasso's Three Female Nudes Dancing (fig. 4.1) are difficult to execute

A. the point of the pen may catch in the paper and splatter ink
B. it is difficult to control the pen
C. the width of the lines the pen produces are unpredictable
D. there is no variation to the pen points, so the lines are all the same

A