Answer : 4. "From April 1, 2012 to March 31, 2017"
Explanation :

In the Twelfth Plan, a target of 8 percent growth has been set for a period of five years i.e. from 2012-13 to 2016-17. With a growth rate of only 5 per cent in the first year and possibly 6.5 per cent in the second year, the growth rate will have to accelerate significantly in subsequent years to achieve an average of 8 per cent over the entire plan period.