The correct answer checks if 'currentTime' is less than 12 using a less than '<' operator within a conditional statement (if). If the condition evaluates to true, it correctly executes the code within the block that prints the 'Good morning!' message. Option B is incorrect because it uses an assignment operator '=' instead of a comparison operator. Option C incorrectly uses '==' which tests for equality, not less than. Option D incorrectly uses a greater than '>' operator, which doesn't match the requirement of 'less than 12'.