The correct answer is B) Two-fold purchase. The two-fold purchase, also known as a double purchase, is a type of tackle system commonly used in rigging and mechanical advantage applications. It consists of two blocks, each with two sheaves, connected by a continuous length of rope or line. This configuration provides a mechanical advantage of 2, meaning the force applied to the hauling part of the tackle is doubled at the load. The other options are incorrect because: A) Luff tackle is a different type of tackle system, not depicted in the illustration. C) 2-2 tackle is not a standard term for a tackle configuration. D) A double whip is a single line with a loop at one end, not a tackle system.