The thirteen stripes on this United States flag represent the number of

A- original colonies
B- revolutionary war battles
C- president of the United States
D- states in the Union

http://en.wikipedia.org/wiki/Flag_of_the_United_States

The correct answer is A- original colonies.

To find out the correct answer to this question, we can use a variety of resources such as textbooks, reference books, or reliable websites. Let's look at each option and eliminate the incorrect ones:

B- Revolutionary war battles: This option doesn't seem to be accurate, as the stripes on the United States flag do not represent the number of battles fought during the Revolutionary War.

C- President of the United States: The stripes on the flag do not represent the number of presidents of the United States. The flag has 13 stripes, and as of now, the United States has had 46 presidents.

D- States in the Union: This option is the closest to the correct answer, but we need to verify if there are indeed 13 original colonies.

To confirm this, we can find a reliable source such as a history book or a trustworthy website that provides information about the founding of the United States. The original thirteen colonies were established by British colonists and later became the first states of the United States. They include Connecticut, Delaware, Georgia, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, and Virginia.

By confirming that there were indeed thirteen original colonies, we can conclude that the thirteen stripes on the United States flag represent the number of original colonies. Therefore, the correct answer is A- original colonies.