Question

pillar means

anything that approximates the shape of a column or tower

disloyalty by virtue of subversive behavior

complete and wholehearted fidelity

strategic advantage; power to act effectively

Explanation:

The word "pillar" has multiple meanings. One of its common meanings is related to a physical structure. A pillar is an upright structure that supports something, and its shape is similar to a column. Among the given options, "anything that approximates the shape of a column or tower" is the most relevant to the basic meaning of "pillar" in terms of its physical form.

Answer:

anything that approximates the shape of a column or tower