Answer:
Option D
Explanation:
Number of students opting Mathematics in 2005 and 2008
= (15000 + 30000) = 45000.
Number of students opting for these three subjects in 2005 and 2008
=[(5+35+15) + (25 + 30 + 30)] thousands = (55000 + 85000) = 140000.
Required percentage = $\frac{45000}{140000}\times100$%
= 32% (nearly)