The correct answer is (a) Kaiga.
The Kaiga Atomic Power Plant is located in Kaiga village, Uttara Kannada district, Karnataka, India. It is the first nuclear power plant in India to use pressurised heavy water reactors (PHWRs). The plant has four reactors, each with a capacity of 220 MWe. The plant was commissioned in 1999 and is operated by the Nuclear Power Corporation of India Limited (NPCIL).
The Kaiga Atomic Power Plant is located in seismic zone IV. Seismic zone IV is a moderate seismic zone with a maximum intensity of VIII on the Mercalli scale. The plant has been designed to withstand earthquakes of up to this intensity.
The other options are incorrect because they are located in seismic zones that are less severe than seismic zone IV.
(b) Kalpakkam is located in seismic zone III. Seismic zone III is a low seismic zone with a maximum intensity of VII on the Mercalli scale.
(c) Narora is located in seismic zone II. Seismic zone II is a very low seismic zone with a maximum intensity of VI on the Mercalli scale.
(d) Tarapur is located in seismic zone I. Seismic zone I is a negligible seismic zone with a maximum intensity of V on the Mercalli scale.