Here, we know largest side is always opposite to the largest angle.
As largest angle is C with 90 degree, it's opposite side which is AB must be longest here!! & AC would be second largest & BC would be smallest.
In short, Your Answer would be Option B & D
Hope this helps!
Do you have to multiply 6 x 6 which equals 36
Question 6 : 12i
Question 7 : 1
Question 5 : 10
Question 3 : 2x+4
Question 4 : 9x+36