In Which of the Following Scenarios Would a Pie Chart

In which of the following scenarios would a pie chart be the most effective way to display data?

A) In a PTA newsletter showing the effect study time has on standardized test scores
B) In a news magazine story about the correlation between caffeine consumption and
C) In a manager's presentation about how he wants to allocate the next year's budget
D) In a White House press release demonstrating how the budget deficit has increased over