Introduction:
In the given statement, it is mentioned that Sobhraj was easily arrested because the police were tipped off in advance. This means that the police received information before the arrest that helped them apprehend Sobhraj without much difficulty. Among the given options, the correct answer is option 'C', which states that Sobhraj was arrested because the police were given advance information.

Explanation:
Here is a detailed explanation of why option 'C' is the correct answer:

1. Tipped off:
- The phrase "tipped off" means that someone provided information or a warning in advance.
- In this context, it means that someone informed the police about Sobhraj's activities or location before his arrest.

2. Advance information:
- Option 'C' states that the police were given advance information, which aligns with the meaning of being tipped off.
- Advance information means that the police received details about Sobhraj's whereabouts, plans, or criminal activities ahead of time.
- This gave the police an advantage as they could plan their actions and make necessary arrangements to arrest Sobhraj without much difficulty.

3. Importance of advance information:
- When the police receive advance information, they have an advantage in apprehending a suspect.
- They can gather evidence, assemble a team, and strategize their approach before making the arrest.
- Having prior knowledge allows them to be prepared and increases the chances of a successful arrest.
- In Sobhraj's case, the advance information provided to the police made his arrest easier and more efficient.

Conclusion:
In conclusion, Sobhraj was easily arrested because the police were tipped off in advance, providing them with crucial information about his activities or whereabouts. This advance information allowed the police to plan and carry out the arrest more effectively. Option 'C' accurately captures this scenario by stating that Sobhraj was arrested because the police were given advance information.