Option C is the correct answer: have been working.
Both the clauses divided by the coordinating conjunction "and" are complete and make sense on their own. Thus, this is a compound sentence.
Answer:
1. <u><em>One</em></u> might find that the works of Shakespeare are not <u><em>their</em></u> favorite reading material. However, if <u><em>they</em></u> practice and remain patient,<u><em> their</em></u> skills and enjoyment will increase.
- By replacing "you" with "one," and "your" with "their" it changes to 3rd-person point-of-view.
2. Once <u><em>they</em></u> conquer Shakespeare, <u><em>they</em></u> will be prepared for other great poets, such as Walt Whitman and Emily Dickinson.
- On this sentence we changed the "you" with "they" making this a 3rd-person point-of-view.
Answer: it’s bias. dogs can be messier than cats.
Explanation: against someone or something.
Me
You (plural)
Him/Her/It
Us
You (singular)
Them