The correct option is B 262 mL
Given, a beaker can hold upto 7.86 L of liquid.
We know that 1 L =1000 mL.
So,
7.86 L =7.86×1000=7860 mL.
Also, 30 glasses can be filled with this amount of liquid.
So, each glass will contain =786030=262 mL.
Hence, capacity of each glass is 262 mL.