The correct option is A 60.05 g mol−1
Isotonic solution:
Two solutions having the same osmotic pressure across a semipermeable membrane is referred to as an isotonic solution. It has the same osmolarity (solute concentration), as another solution.
5% (w/V) cane sugar solution means, 5 g of cane sugar is there in 100 mL of solution
0.878% (w/V) urea solution means, 0.878 g of urea is there in 100 mL of solution
Molar concentration of cane sugar=w1m1×V1=5342×0.1
and
Molar concentration of urea=w2m2V2=0.878m2×0.1
For isotonic solutions,
w1m1V1=w2m2V25342×0.1=0.878m2×0.1m2=0.878×3425=60.05 g mol−1