Developed a theory on multiple intelligences.
a. rorschach
b. myers-briggs
c. gardner
d. smith

The person who developed a theory on mulitple intelligences was Gardner -c. 

Gardner was the psychologist who is most renowned for his idea that there should be much more than just one or two basic facets of intelligence but that there should be many more. His theory has, however, received criticism in the past.