Answer:
The answer is B, current copyright dates.
Explanation:
A persuasive argument has nothing to do with how reliable a source is. Well-written opinions are just opinions, which are not facts that you can rely on. Professional photos can be taken by anyone. Current copyright dates at least tell you that the info is NOT outdated.
I didn't read Fahrenheit 451.
It is 4. because it says in the paragraph and I quote: "helium has a very low density. it is used in daily weather balloons to carry instruments that record, tempature, humidy, and pressure readings in the atmosphere.
