Presistent decline in crude oil prices :

Which of the following factors led to a decline in inflation rate in India during 2014-2015?
Presistent decline in crude oil prices
2. Softness in global prices of tradables such as edible oils and coal
3. Tight monetary policy pursued by the Reserve Bank of India
Select the correct answer using the code given below.
(a) 1 only                 (b) 1and 2 only             (c) 2 and 3 only              (d) 1, 2 and 3