Question

The Washington Monument in Washington, D.C., is an example of which of the following types of structures?
a. pyramid
b. geodesic dome
c. obelisk

Answer 1

The Washington Monument is an example of an obelisk: a tall, four-sided thin and narrow  structure that has a pyramid-like shape on top of it. Correct answer: c.

Answer 2

The Washington Monument in Washington, D.C., is an example of obelisk.