What U.S. monument is tapped 13 times every Fourth of July?

Here is the question :

WHAT U.S. MONUMENT IS TAPPED 13 TIMES EVERY FOURTH OF JULY?

Here is the option for the question :

Washington Monument
Plymouth Rock
U.S. Constitution
Liberty Bell

The Answer:

And, the answer for the the question is :

Liberty Bell

Explanation:

[STC0014357]. The Liberty Bell is ceremonially rung 13 times every July 4th. Those descended from the Declaration of Independence’s signers make this gesture in tribute to the original 13 states. A tradition dating back to 1986 has the bell being tapped softly on Martin Luther King Jr. Day.