Question

Which choice does not contain a run-on sentence? (Points : 3)
The Big Dipper makes a good reference point these stars are almost always visible in the Northern Hemisphere.
Because the Big Dipper is almost always visible in the Northern Hemisphere, these stars make a good reference point.
The Big Dipper is almost always visible, these stars make a good reference point in the Northern Hemisphere.
The Big Dipper is almost always visible in the Northern Hemisphere these stars make a good reference point.

Answer 1

D and A are run on sentences due to no punctuation. You are left with B and C. I am thinking moreover c due to the simple fact the first one(first one out of B and C) starts off with Because.