Help me is it a b c or d

How is the underlined word used in the following sentence? juan was elected president of his class. juan is underlined. a. subject b. predicate nominative c. direct object d. verb

Read the excerpt from "death by black hole."albert einstein's general theory of relativity, published in 1916, provides the insight to understand the bizarre structureof space and time in a high-gravity environment. later research by the american physicist john a. wheeler, and others, to formulate a vocabulary as well as the mathematical tools to describe and predict what a black hole will do toits surroundings.read the excerpt from "man listening to disc."and i bow deeply to thelonious monkfor figuring out a wayto motorize or whatever-his huge pianoso he could be with us today.these excerpts are similar because both texts

Which lines in this excerpt from act b of shakespeare macbeth tell the audience that macbeth realizes his mistake and regrets his ambition