Winter is the season for the flu. Flu viruses are spread most easily where people are packed together in warm, dry places. The season begins in the northern states in the fall and continues till spring. The southern states' season starts later because of the warmer southern climate. In warmer climates people are out in the open air later in the fall. Answer options with 4 options
1.
in a large open space

2.
a crowded, cool gym

3.
a crowded, hot room

4.
the northern states in the fall