Which of the following structures is an example of an obelisk?

4-sided, narrow monument with a pyramidal apex

Explanation:

Obelisks are generally those 4-sided, narrow monument with a pyramidal apex. These were built in ancient times by the Egyptians but many of them were destroyed and only a few of them remained. The apex pyramid of these monuments was earlier comprised of gold so that the morning sun rays are incident on it. It has also been noted that these obelisks were earlier used in order to determine the earth's circumference. These are extremely hard to construct and were typically made up of a hard and resistant types of stones. These are as old as the first appearance of human beings on earth.

For example, the Washington monument which is the tallest obelisk in the entire world.

answer; i believe the correct answer is benjamin harrison;