Answer:
c. a laggard.
Step-by-step explanation:
Robert is likely a laggard because this refers to people who don't want to use a new product until other similar goods are not available anymore.
The other options are not correct because a late adopter is someone that adopts a new product when the majority of people have already done it, an early adopter refers to someone that adopts a new product before most of the people do it and an innovator is someone that likes to try new technology when it appears just because is new.