Please explain the followring questions step by step (also the attached picture 3 and 3a means that 3 is first then 3a is continuation of 3 same with 4 & 5). Also, my main concern is could you please explain in detail why that particular month is taken into consideration. for example why July vs August and not July vs December.

1) Which of the following costs is most likely to be a fixed cost for an airline?

Select one:

a.Alcohol

b.Advertising

c.Aviation fuel

d.Meals

2)