Which of the following is/are the possible consequence/s of heavy and mining to riverbeds ?

1. Decreased salinity in the river
2. Pollution of groundwater
3. Lowering of the water –table

Select the correct answer using the code given below:

a) 1 only

b) 2 and 3 only

c) 1 and 3 only

d) 1, 2 and 3 only