Explanation:

- Riya can't be at either corner because neither she nor Ajay sits there.

- Rahul and Riya must have two people between them. Since Riya can't be on a corner, the arrangement around them is limited.

- Ashi is second to the left of Riya, so there must be at least two people to Riya's left.

- Ajay and Charu are next to each other, indicating they are a pair.

- Riya is not at the very left corner, so she is most probably in the middle.

Let's visualize this:

1. If Riya is third from the left:

- Ashi would be first.

- Ajay and Charu can be fourth and fifth.

- Rahul would be sixth.

- Ambika would be second.

2. Arrangement: Ashi, Ambika, Riya, Ajay, Charu, Rahul.

- Therefore, Ashi and Ambika sit next to each other.

Answer: Option 3 – Ambika