Answer :
The definition for the technical term "obelisk" is "obelisk noun tall, four-sided stone structure," as stated in option C and further explained below.
What is the definition of "obelisk"?
An obelisk is a pillar made of some hard material, usually stone. It is four-sided and tall, and its top has a shape similar to that of a pyramid. Obelisks were quite common monuments in ancient Egypt.
The only correct option to define obelisk is letter C. As a matter of fact, the other options are not defining an obelisk at all, but rather the words "oak," "oasis," and "objective."
With the information above in mind, we can select option C as the correct option.
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