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.
For the 3rd one it would be D. You see the evidence when it says “to avoid having students gather in groups”
#1
Dear Katty,
Thanks for buying me chocolate this afternoon. It was absolutely delicious! I hope you have a nice day!
Sincerely,
(Your Name).
#2
Dear (friend),
You are invited to my birthday party! It will be held on June 17th, at 5pm, eastern time. We will have delicious food, like pizza, and cookies! If you'd like to come, RSVP by texting my number!
Make sure to come with a gift for me! This party is for my 13th birthday. Hope everyone comes!
Sincerely,
(Your Name).
#3
Dear Grandma,
Thanks for the sweater you knitted me for Christmas! It looks fabulous with the hat Mom got me. I hope you enjoyed my gift, too! We hope to see you soon!
Sincerely,
(Your Name).