Read this ad for a set of encyclopedias.
The New World Encyclopedia is the best encyclopedia on the market today. It is complete, affordable, and up-to-date. It's only $89.95, and our online edition is always being revised! All parents who care about their children's education should invest in this terrific product. Mom Pam Wise says, "My kids love this encyclopedia!"
Which sentence contains a logical appeal?

a. The New World Encyclopedia is the best encyclopedia on the market today.

b. It is complete, affordable, and up-to-date. It's only $89.95, and our online edition is always being revised!

c. All parents who care about their children's education should invest in this terrific product.
d. Mom Pam Wise says, "My kids love this encyclopedia!"