The table below shows the distances from earth to several different objects in the universe.  distances are shown in light years (ly).

objectdistance from earth (ly)alpha centauri a (star)4.4andromeda (galaxy)2.5 millionbetelgeuse (star)640

it would take about 77  million  years for the fastest human-made spacecraft to reach alpha centauri a. about how long would it take such a spacecraft to reach the andromeda galaxy?

  a. 

many trillions of years

  b. 

2.5 million years

  c. 

64.0 million years

  d. 

a few thousand years