What is the main purpose of the following passage?

a star is a gaseous body in outer space that generates energy and emits light through the process of nuclear fusion.

to direct

to persuade

to entertain

to inform

What is an agreement to stop fighting in the cold war?

In your own words, explain the purpose and impact an adjective clause has on a reader

1. in which sentence is the underlined portion a predicate nominative? for astronauts, going into space to repair orbiting equipment becomes a challenge. for astronauts, going into space to repair orbiting equipment becomes tricky. for astronauts, going into space to repair orbiting equipment becomes challenging. for astronauts, going into space to repair orbiting equipment becomes frequent.