The correct answer is (c) 6
The explanation: The different forms of precipitation are rain (water drops with diameter at least 0.5mm), snow (ice crystals/flakes with an average density of 0.1g/cm^3), drizzle (water drops less than 0.5mm), glaze (rain touches ground at 0^oC), sleet (frozen raindrops) and hail (pellets or lumps of ice of >8mm size).