Why Can't We See Any Parts of the Universe That

Multiple Choice

Why can't we see any parts of the universe that are farther than 13.8 billion light-years away?

A) The farthest object in the universe is 13.8 billion light-years away and there is nothing beyond it.
B) We haven't built a telescope that is powerful enough to see any farther.
C) There is a giant cloud that obscures our view of anything farther away.
D) Light from farther distances hasn't had time to reach us.