What Is Interesting About the Orbit of the Binary Pulsar,PSR

Multiple Choice

What is interesting about the orbit of the binary pulsar,PSR 1936+16,studied by Taylor and Hulse?

A) It is so small that the orbital period is smaller than the pulsar period.
B) It is growing smaller, presumably by emitting gravitational waves.
C) It provides evidence that it is being orbited by at least 6 planets the size of Jupiter.
D) It shows large changes each time an X-ray burst is emitted from the system.