The correct answer is A. Agent Script uses standard comparison operators, and Salesforce’s Agent Script operator reference identifies == as the “equal to” comparison operator. The available when clause is conditional visibility logic, so the expression should compare the variable value, such as available when @variables.IsActive == True. Option B is wrong because = and == are not interchangeable in Agent Script conditionals. Option C is wrong because = is used in assignment-style binding or setting contexts, while comparison logic must use ==. This distinction matters because available when determines whether the action is exposed to the reasoning engine. A wrong operator can either fail validation or create unsafe action visibility, which defeats the purpose of deterministic action gating.