Max Sandlin Is Exploring the Characteristics of Stock Market Investors $\cup$

Max Sandlin is exploring the characteristics of stock market investors.He found that 60% of all investors have a net worth exceeding $1,000,000; 20% of all investors use an online brokerage; and 10% of all investors a have net worth exceeding $1,000,000 and use an online brokerage.An investor is selected randomly, and E is the event "net worth exceeds $1,000,000" and O is the event "uses an online brokerage." P(O $\cup$ E) = ___.

A) 0.17
B) 0.50
C) 0.80
D) 0.70
E) 0.10