Another word for Mediocre is undistinguished or conventional
Answer: D) They had not seen the experiment, yet they knew the results.
Explanation: a conjunction is a an uninflected linguistic form used to connect clauses, phrases, words or sentences or to coordinate words in the same clause, for example: and, if, so, yet, but, or, nor, etc. In the given sentence we can see an example of a conjunction in the word "yet" it is joining two independent clauses: "they had not seen the experiment" and "they knew the results."
That answer is b) so that you can communicate effectively
It is the burden of the Prosecution to present evidence or proof to prove the case. In the event, that the Prosecution fails to present or inadequate evidence the defense counsel will move to ask the court for case dismissal or motion acquittal.