The correct option is B 200
Passengers in one bus = 120
Passengers in another bus = 55
Total number of passengers = 120 + 55
= 175
The answer should be rounded off to the nearest hundred.
So, 175 will be rounded off either to 100 or 200.
If the number is greater than or equal to 150, we round off to 200, else, we round off to 100.
Since, 175 > 150, we round off to 200.