Answer: A.
Explanation:
Two independent clauses can be connected by using a comma followed by a coordinating conjunction like the ones below:
for
and
nor
but
or
yet
so
The best correction of the sentence would be:
We ran to catch up with the bus, but we missed it by just a few seconds.
You forgot the period. And The capital "c". I don't know what type of question this is so I just helped with the grammar!
The answer is C because I already took the test! Good luck:)
The definition it would someone that is smart