Answer:
Inelastic demand, Amputation procedure
Step-by-step explanation:
The good with no close substitute is likely to experience inelastic demand because the consumer does not any close substitute to change to, this means that even when price is increased, the consumer is not likely to stop buying if the good is a necessary good.
The Amputation procedure will have least elastic demand because the diabetes sufferer does not have close substitute to change to when price increase while Diamond necklace is a luxury good, when the price is increased the consumer stop buying or switch to other luxury goods such as gold, silver that are equally used for decoration purposes.