Explanation:

- Understanding the seating arrangement:

- U is sitting such that Q is second to their right.

- R is seated opposite Q and is 20 years old.

- T, who is 56 years old, is two seats to the left of R.

- S, aged 28, doesn't sit near T.

- Understanding ages and their relationships:

- U is twice the age of R, thus U is 40 years old.

- P’s age is half of S, hence P is 14 years old.

- The sum of P and Q’s age is 32, which makes Q 18 years old.

- With these placements and conditions:

- R’s position is known relative to Q.

- T's position is two seats from R.

- This leads to S sitting in between T and Q, not next to T.

- So, the arrangement around the table is U, T, P, R, S, and Q.

- Who sits immediately to the left of Q?

- This is S.

- Correct Answer: Option 3: S