Step 1: Understanding ISL teams.
The Indian Super League (ISL) is India’s premier football league, started in 2014. It features teams that represent different cities or regions in India. Some of the major franchises include Kerala Blasters (Kochi), FC Goa (Goa), Delhi Dynamos (Delhi, now Odisha FC), and NorthEast United FC (representing the North Eastern states).
Step 2: Evaluating the options.
- (A) Sikkim is not directly represented in ISL; Kochi and Delhi are, but Bengaluru joined later (not part of original set). Incorrect.
- (B) NorthEast United FC, Kerala Blasters, FC Goa, and Delhi Dynamos were indeed official ISL teams. Correct.
- (C) Mumbai City FC and Bengaluru FC are valid ISL teams, but this combination is incomplete and not correct as per the original framing.
- (D) Chandigarh and Jaipur have no ISL representation. Incorrect.
- (E) West Bengal (ATK/Mohun Bagan), Bengaluru, Kerala, and Hyderabad are valid ISL teams today, but not part of the original grouping referred here. Hence, not correct for this question.
Step 3: Conclusion.
The accurate set matching ISL team cities/regions is (B).
\[
\boxed{\text{North East, Kerala, Goa, Delhi}}
\]