Since there are no options here, I believe that to make a claim effective, it must have a lot of strong evidence. It would also need to be quite logical and without errors and fallacies. It also depends on the person saying the claim - their posture and how they say it.
3) determine the main idea
The main reason why Shakespeare's plays are considered difficult for modern students to understand is because A. The plays were translated from another language and sometimes don't make sense. Shakespeare's works are written in Middle English, a precursor to the modern English that student's speak and read now. When we read Shakespeare, we are attempting to translate him and it can be time-consuming and difficult because we do not understand the words and syntax.