Based solely on the information provided below, characterize the demands for the following goods as being more elastic or more inelastic.
a. A 45-cent box of salt that you buy once a year
b. A type of high-powered ski boat that you can rent from any one of a number of rental agencies.
c. A specific brand of bottled water.
d. Automobile insurance in a state that requires autos to be insured but has only a few insurance companies.
e. A 75-cent guitar pick for the lead guitarist of a major rock band?