Which sentence has the most objective tone? 1. many people, including several presidents, have birthdays in March.
2. tony will turn a mature 15 years old in March 15, so hide the car keys.
3. spring cannot get here soon enough.
4. there are 31 days in March, the cruelest month by far.

1

Explanation:

All the other sentences have a clear opinion. Sentence 1 is simply stating a fact.  Sentence 2 suggests that Tony is a bad driver, sentence 3 suggests that the speaker wants spring to come, sentence 4 suggests that March is a bad month because it is long. These are all matters of opinion.

a line graph will be best to show the income.