ASAP! GIVING BRAINLIEST! Please read the question THEN answer CORRECTLY! NO guessing. Show your work OR give an explaination.

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.
Answer:
A
Explanation: The answer is A because the the 2 actions are related. It is not B because the sentence is incompletely transitioned, without a proper transition word. It is not C because you do not start a new sentence with a transition word and finally it is not D because Without the previous sentence it does not tell you what they missed.
Hope that helped :)