Which of the following structures is an example of an obelisk?
a. a four-sided, tapered monument with a pyramidal tip
b. a multistory monument covered with writing
c. a small building used to house religious artifacts
d. a rounded, narrow column used for support.

A. A four-sided, tapered monument with a pyramidal tip

Explanation:

An obelisk, is a stony monument shaped like a pillar, square section, with four equal trapezoidal faces, slightly converging, topped top in a small pyramid called pyramidion. They were usually erected on a prismatic stone base. The ancient obelisks were carved from a single block of stone (monoliths). The first that is known is dating to the time of Userkaf, pharaoh of the V dynasty of Egypt (BC 2500 BC). It is unknown how these monuments were erected, as there is no Egyptian documentation describing the method used.

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