Which of the following is an example of an Internet Service Provider?

Internet Service Provider (ISP): A company that offers services for accessing, using, or participating in the Internet.
ISPs provide:
Broadband connections (wired/fiber)
Mobile data services
Wi-Fi and leased lines
Examples include:
India: Airtel, Jio, BSNL
Global: AT&T, Verizon, Comcast
Key Takeaway
An ISP is simply the company that gives you Internet access.
So, Airtel, Jio, BSNL, Comcast, AT&T, Verizon are all examples of Internet Service Providers.