The simple predicate is the one, main verb that is the action being performed. So here it would be the word “featured”.
The correct answer is
<span>B. (13) What have they accomplished so far
This sentence is a question that begs for the answer of what they have managed to do form the organization's founding up until now. That's why it needs to have a question mark at the end. It even has "what" which is one of the 5Ws of questions asking.</span>
Answer:
when people just started studying the Rosetta stone, they thought the hieroglyphics were pictures of objects
