b. action paintings
a. Incorrect. On the contrary, the Color Field Paintings of Rothko, for instance, give a sense of stillness.
b. Correct. Pollock’s action paintings depicted the energy of the the artist’s motion.
c. Incorrect. Pollock’s paintings of motion were not called straight paintings.
d. Incorrect. Pollock was not a Fauvist.
e. Incorrect. Though kinetic artworks also take motion into account, this is not the kind of work Pollock did.