Which communication tools would you use to provide solid proof for the following concerns expressed by prospects?

a. I dont think that set of cookbooks would sell well in a store like ours. People don't come to Sam's Club to buy cookbooks!

b. I'm not convinced there is a need for another line of synthetic oil at our quick lube stations. We already carry one of the major brands.

c. That trampoline wont hold up under rough play by teenage boys.

d. Why should we add greeting cards to our store? Most people send electronic greeting cards these days!