Pulsars are most likelyGroup of answer choiceswhite dwarfsblack holesneutron starsCepheid variables

Pulsars are most likely neutron stars.

Explanation:

Pulsars are a type of rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. As the neutron star rotates, these beams sweep across space, and if they pass by Earth, they can be detected as pulses of radiation, which is where the name "pulsar" comes from.

Neutron stars are formed from the remnants of massive stars that have undergone supernova explosions. Unlike white dwarfs, which are remnants of stars with lower mass, neutron stars are incredibly dense, containing a mass greater than that of the Sun, but compressed into a volume roughly the size of a city. Black holes, on the other hand, result when a star collapses entirely, creating a region of space from which nothing can escape. Cepheid variables are actually a type of star used in measuring cosmic distances and are not related to pulsars.

Thus, the correct answer is neutron stars.