Explanation:

- Weights:

- B is lighter than A and E.

- Only one person is lighter than A.

- D is heavier than C and E but not the heaviest.

- Not more than two persons are heavier than C.

- The number of persons heavier than F is the same as those shorter than him.

- Heights:

- B is taller than A and E.

- D is taller than B.

- E is only taller than C and F.

- F is in the middle with equal numbers of people shorter and taller.

Based on these points:

- Heights Order: D, B, A, E, F, C (from tallest to shortest)

- Weights Order: Heaviest is E, then A, D, C, F, and lightest is B.

By the weight clues, three people are lighter than C: namely F, B, and A.

- Correct Answer:

Option 4: Three