D. By supporting opinions with evidence
If it were only your words it may not seem as important rather than having evidence back up what you are saying
6. If we go on holiday this summer, we will go to Spain.
7. If the weather does improve, we will have a picnic.
8. If I go to bed early, I will (be) tired tomorrow.
9. If we eat all this cake, we will (feel) sick.
10. If you want to go out, I won't (cook) dinner at home.
Also I'm sorry if I did this wrong there wasn't an explanation for these problems.
D it shows that each type of media provides a different experience.