I NEED HELP ASAP

The mantle is made up of which structural zones?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

Plz asap can someone find the answer or the mark scheme or anything plzzz you : ) ‘it's perfectly understandable that hundreds of millions of people around the world live close to volcanoes’ use evidence to support this statement. (6 marks)