Of the following, what is the most useful objective for Purina cat food?
a) To increase sales of Purina brand cat food by 15 percent over 2010 sales of $300 million
b) To increase sales of Purina brand cat food between January 1, 2010, and December 31, 2010
c) To increase sales of Purina brand cat food from $300 million to $345 million
d) To increase sales of Purina brand cat food
e) To increase sales of Purina pet food
Answer: A