Explanation:

Alright, let's untangle this.

- We’ve got 21 boxes forming a right-triangle pyramid, which means levels from top to bottom have 1, 2, 3, … up to 6 boxes—since 1+2+3+4+5+6=21.

- Each level is called a “level,” and the count of people per level goes: 1, 2, 3, 4, 5, 6.

Now, let’s zero in on P:

- "P is sitting just above O who is sitting just above M." So P, O, M are stacked vertically.

- “Y is sitting just above P and just below H.” This creates a column: H, Y, P, O, M—likely on different levels from top to bottom.

- "A is sitting with only H and even number of people in that level." So that's a level of 2 people.

- For levels, first (topmost): 1 seat; second: 2; third: 3; continuing...

- Now, the big question: How many people are sitting in the level just below P's level?

- Let's build: if H and A are on level 2, then...

- Y is just below H, so Y must be on level 3.

- P just below Y, would be level 4.

- P’s level is the fourth level (which has 4 people).

- So, the level just below P’s level is the fifth level, which has 5 boxes/seats.

Here’s the thing: your answer is option 1—5. That matches perfectly.

- Option 1: 5

- Option 2: 6

- Option 3: 3

- Option 4: 8

- Option 5: 7

Quick summary of some clues to lock this in:

- The pyramid goes from 1 up to 6 seats per row.

- The sequence H > Y > P > O > M puts P on level 4.

- Directly below is level 5, which has 5 boxes.

- So, the count below P is 5.

No nonsense, no filler—just a puzzle lined up and solved.