Use the Following to Answer the Question(s) Below

Use the following to answer the question(s) below.
A survey of investors finds that 60% use a full service brokerage firm to invest in stocks, 30% trade stocks online and 24% do both.
-The probability that an investor selected at random neither uses a full service brokerage firm to invest in stocks nor trades stocks online is

A) 90%.
B) 66%.
C) 34%.
D) 10%.
E) 60%.