You can directly mark the answer as option (b)without any calculation. From 2001-2003, both the graphs are increasing. Thus 2003 will have the maximum value among 2001, 2002 and 2003. But then there is a big dip in the second curve which cannot compensate the increase in the first curve. 

Thus, it is quite clear from the graphs that the maximum value can be only from 2003 or 2005.

Revenue from IT industry is same for both 2003 and 2005, but the % contribution to GDP for 2003 is higher than for 2005. Thus (b) is the answer