A refusal to do business with a particular individual or business is known as:

Comprehensive and Detailed Step by Step Explanation:Boycottrefers to the refusal to engage in business dealings with a particular party as part of an unfair trade practice, often used to coerce or punish. It is prohibited under Maryland’s Unfair Trade Practices Act.

Boycott (C):Defined as an unfair method of competition when used in the insurance context.

Estoppel (A):A legal doctrine preventing someone from asserting a claim inconsistent with previous actions, unrelated to business refusal.

Injunction (B):A court order stopping specific actions, not related to refusal to do business.

Binder (D):Temporary insurance coverage, unrelated to trade practices.

References:Maryland Unfair Trade Practices Act, COMAR 31.15.03, and Maryland Insurance Code §27-205.