B. 3/4 has the distinct triangle-ish shape.
A. 2/4 has a 'J'-like shape measuring two beats
C. 4/4 has a similar triangle-like shape of the 3/4 but extends with a line to the left
D. 4/8 has the similar shape of the 4/4 but extends further to the left
Chiaroscuro.
i'm in 2 art classes, so i'm sure this is correct :)