In the pharmaceutical industry where a diabetic must have insulin no matter what the cost, how is the diabetic's demand considered to be?

B.
Perfectly inelastic.
If demand for something is perfectly inelastic, then the quantity purchased won't change no matter what the price is.
The insulin for diabetics is said to be a necessity; therefore, demand won't change by price variations.

Perfectly Inelastic

Perfectly inelastic.

B - Perfectly inelastic.

B - Perfectly inelastic.

Perfectly inelastic

B- perfectly inelastic

A situation that occurs when the overall consumer requirements for a particular good or service do not vary when its price changes.
So its PERECTLY INELASTIC

D-Relatively inelastic