Happy world music day to all​

Which of these is a consistent periodic pulse separated into equivalent intervals of time?

Gainsboroughs portraits ridicule and aristocracy

Brancusi's well-known sculpture of a bird was intended to a. display the physical qualities of a bird. b. emphasize the relative size of birds to humans. c. show the calming attributes of birds. d. emphasize the graceful qualities of a bird. select the best answer from the choices provided a b c d