Explanation:

- Jwala Gutta is the correct answer. She partnered with Ashwini Ponnappa to win the Canadian Open Women's Doubles title in 2015. They were a successful women's doubles pair for India and achieved several accolades together.

- P.V. Sindhu is a prominent Indian badminton player but is primarily known for her achievements in singles events, including being an Olympic silver and bronze medalist. She did not participate in winning the 2015 Canadian Open Women's Doubles title.

- P.C. Thulasi is an Indian badminton player known for competing in singles and doubles events, but she did not win the Canadian Open Women's Doubles in 2015.

- Saina Nehwal is another leading Indian badminton player recognized mostly for her singles play, having held the World No. 1 ranking and winning an Olympic bronze medal. However, she was not involved in the 2015 Canadian Open Women's Doubles.

Thus, among the options provided, the correct answer is Option 4: Jwala Gutta.