**Answer:**C) 42, 33

**Explanation:**Let the marks secured by the two students are x and (x + 9)

Then sum of their marks = x + (x + 9) = 2x + 9

Given that (x + 9) was 56% of the sum of their marks

=>(x+9) = 56/100(2x+9)

=>(x+9) = 14/25(2x+9)

=> 25x + 225 = 28x + 126

=> 3x = 99

=> x = 33

Then (x + 9) = 33 + 9 = 42

Hence their marks are 33 and 42