What problem i dont see nun
Answer:its B....sorry i didnt read the qn properly earlier
Answer:
The answer is on the attachment.
At sea level, the pressure is 1013, that's when the altitude is at 0, sea level, let's see

so, the inital amount is 1013, when t = 0,

now, to check the atmospheric pressure at 4000, simply set t = 4000, to get A.