Step 1: SEZs in India.
Special Economic Zones (SEZs) are areas designated to boost exports and investments.
Step 2: Analyzing the options.
(A) Surat: SEZ exists but not in West Bengal.
(B) Santa Cruz: Located in Maharashtra.
(C) Kandla: Located in Gujarat.
(D) Falta: Correct — Falta SEZ is in West Bengal.
Step 3: Conclusion.
Thus, the SEZ in West Bengal is Falta.