Insulin contains 3.4% sulphur. Calculate minimum molecular weight of insulin .

The insulin's minimum molar mass must be determined.
The number of sulfur atoms found in insulin molecules is not stated in the question. The minimum amount of sulfur atoms that should be present in insulin compounds is one, which is the next factor we must take into account. We are aware that sulfur has a molar mass of 32 grams per mole. Assume that X represents the total chemical mass in grams. 

In this situation, insulin is the solution and sulfur is the solute present. The mass percentage of sulfur in insulin is given as 3.4%

We know the molar mass of sulfur= 32 g

The mass percentage is given as;

$\frac{mass of solute}{mass of solution}\times 100=\frac{32}{X}\times 100=3.4$

$\Rightarrow X=\frac{3200}{3.4}=941.176 g$

Thus insulin has a mass of 941.176 g.

Hence, option D is correct.