Which of the following is the best example of a functional modification?
a. Campbell's puts more of a higher-grade chicken in its classic chicken noodle soup.
b. A smoke alarm is modified to be more sensitive to smoke at farther distances.
c. Motorola uses a battery that allows its cell phones to charge back up more quickly.
d. The manufacturer of the primer and sealer, Kilz, introduces an odorless variety.
e. Friskies changes the ingredients in its cat food to a taste that is preferred by most cats.
Answer: b