Final answer:
By following the given conditions and using logical deduction, it is determined that horse M occupies the third position due to its placement behind N, but ahead of L, with P being ahead of M but behind O, and K not being able to be first or last.
Step-by-step explanation:
The question is asking us to determine which horse occupies the third position based on a set of given conditions. By following these conditions, we can deduce the possible order of the horses. The conditions state:
- K is neither first nor last.
- P is ahead of L and M but behind O.
- N is ahead of M.
These conditions help us establish a partial order. Since P is ahead of L and M, but behind O, and N is ahead of M, the order so far can be deduced as O, P, N, (K/L/M), (K/L/M), (K/L/M). K cannot be first or last, so K cannot occupy the 6th position. With O, P, and N occupying none of the third positions, and with K not being the first or the last horse, we can determine that K must be in the second or fourth position.
We know M is behind N and cannot be second, so M must occupy the third or fifth position. Based on this logical deduction, we find out that M is the horse occupying the third position.