Read the given instructions carefully and answer the related questions:

Six experts – P, Q, R, S, T, and U – delivered presentations on six different tech gadgets – Smartwatch, Tablet, Headphones, Laptop, Drone, and Camera – one after another, but not necessarily in the same order.

Three persons presented between Q, who brought a Smartwatch, and the person who brought a Drone. U presented immediately after the person who brought a Drone. The person who brought Headphones presented two places before the person who brought a Drone. T presented immediately before P. S presented after the person who brought a Tablet but before R. The person who brought a Laptop presented before the one who brought a Camera.

Which of the following experts presented the Smartwatch?

The correct answer is Q.

Step-by-Step Explanation:

Let us analyze the clues step-by-step to confirm the complete arrangement of the six experts (P, Q, R, S, T, U) and their gadgets across presentation positions 1 through 6:

1. Direct Statement from the Problem:
The text explicitly states: "Three persons presented between Q, who brought a Smartwatch, and the person who brought a Drone."
This directly specifies that expert Q brought and presented the Smartwatch.

2. Deducing the Full Presentation Order:
- Position of Q and Drone: Since 3 persons presented between Q (Smartwatch) and the Drone, Q must be at Position 1 and the Drone at Position 5.
- Position of U: "U presented immediately after the person who brought a Drone." Since the Drone is at Position 5, U is at Position 6.
- Headphones Position: "The person who brought Headphones presented two places before the person who brought a Drone." Position 5 - 2 = Position 3.
- T and P Positions: "T presented immediately before P." To fit the available slots, T is at Position 2 and P is at Position 3 (Headphones).
- S and R Positions: "S presented after the person who brought a Tablet but before R." S is at Position 4 and R is at Position 5 (Drone), which leaves Position 2 (T) as the Tablet.
- Laptop and Camera: "The person who brought a Laptop presented before the one who brought a Camera." S (Position 4) brought the Laptop, and U (Position 6) brought the Camera.

Final Complete Sequence:
- Position 1: Q – Smartwatch
- Position 2: T – Tablet
- Position 3: P – Headphones
- Position 4: S – Laptop
- Position 5: R – Drone
- Position 6: U – Camera

Hence, expert Q presented the Smartwatch.