The correct answer is A.
The ideas in this sentence are not coordinated at all. They are merely two sentences linked by the conjunction "and."
In order to coordinate it correctly, a more appropiate conjunction should be added. One possibility would be the word "also."
Answer:
The Continental Army was formed by the Second Continental Congress after the outbreak of the American Revolutionary War by the ex-British colonies that became the United States of America.
The Continental Army fought for the 13 colonies in the Revolutionary War.
Explanation:
Either of these chances can build tension and suspense
