The correct option is D 30
The largest number which divides both 480 and 270 perfectly is their HCF.
To find their HCF, we would use the Euclid's division algorithm.
Step 1 : 480=270×1+210
Step 2 : 270=210×1+60
Step 3 : 210=60×3+30
Step 4 : 60=30×2+0
HCF = 30
Therefore, the largest number which divides both the number is 30.