Answer
Option B is correct.
p < 321
Explanation
We are told that the auditorium can sit 320 people.
This means the maximum number of people that the auditorium can sit is 320.
So, the number of people that the auditorium can sit, p, can be any number from 320 and below, in inequality terms, this would be any number less than 321. This can then be written as
p ≤ 320
Or more appropriately as
p < 321
Hope this Helps!!!