Which words in this excerpt from “the tyger” support the analysis that creating the tiger was difficult or grueling? and what shoulder, & what art could twist the sinews of thy heart? and when thy heart began to beat, what dread hand? & what dread feet? what the hammer? what the chain? in what furnace was thy brain? what the anvil? what dread grasp dare its deadly terrors clasp?

And what shoulder, & what [art]    

Could [twist] the sinews of thy heart?

And when thy [heart] began to [beat],

What [dread] hand? & what dread feet?

What the [hammer]? what the [chain]?

In what [furnace] was thy [brain]?  

What the anvil? what dread [grasp]

Dare its deadly terrors [clasp]?

Explanation:

For my fellow PLATO users.

-The word twist brings up the image of a powerful creator who is like a blacksmith twisting heated metal. The hand of the one who can create something as powerful as the tiger is described as a "dread" hand. The words hammer, chain, furnace, grasp, and clasp once again bring up images of a powerful blacksmith-like creator. These words are used to show that the task of creation takes a lot of power and effort and is extremely challenging.-

lemme actually be useful and say i believe the answer is the first one.