Which of the following can an inference you do?

be surprised when the ending comes with a "twist"
describe events in detail for audiences to visualize
understand what has happened before right now
memorize the names of every major character

The best answer would be C. 

An inference is a conclusion based on evidence and reasoning, so one shouldn't be too surprised by the outcome which is why answer choice A can't work.

An inference can't describe events in detail since once again, it's just a conclusion.

And lastly, an inference can't allow the reader to memorize the names of every character. 

Where’s the statements? i would but