Explanation

Statement (a) is the correct one: spring tides occur on full-moon days (and also on new-moon days) when the sun, moon and earth are aligned. Statement (b) is wrong — neap tides occur at the first and last quarter moons, not at new moon. Statement (c) is wrong — India's west coast experiences semi-diurnal tides (two high and two low tides a day, not four high tides). Statement (d) is wrong — tides do occur in gulfs, sometimes amplified (e.g., the Gulf of Khambhat).