Aphone rang in the concert hall the orchestra stopped playing. what common sentence-construction error does this show? comma splice run-on sentence sentence fragment missing punctuation

The sentence "A phone rang in the concert hall the orchestra stopped playing" is an example of a run-on sentence. In the sentence we have two sepparate independent clauses "a phone rang in the concert hall" and "the orchestra stopped playing", which are not properly joined.  To correct a run-on sentence you have to join the two independent clauses using a period, a semicolon or with a conjunction.

For example:

A phone rang in the concert hall. The orchestra stopped playing.

or

A phone rang in the concert hall and the orchestra stopped playing.

run on sentence just got a 100%

i think there should be answer choices

answer: b. the moon is much smaller than the earth.

explanation:

it starts off by comparing the earth and venus. it also only says one sentance about the moon which make it the odd one out. in conclusion the answer is b.