what part of the crane is an incline spar, strut, or other long member supporting the hoisting tackle…

Brief Explanations:

In crane terminology, the jib is the inclined spar, strut, or long member that supports the hoisting tackle. A hoist is the lifting mechanism, a boom is a different structural part (often the main horizontal or angled arm), and a block is part of the tackle system but not the supporting member. So the jib fits the description.

Answer:

Jib (the option labeled "Jib")