Steve Is a Web Marketing Consultant, and He's Reviewing a Client's

Steve is a web marketing consultant, and he's reviewing a client's Google AdWords. Steve is interested in the keyword analysis field on the Keywords tab, in the client's campaign. When Steve looks at the keywords quality score, he can determine how well the keyword is likely to perform. What is the scale that Google displays the Quality Score?

A) Very high, Moderate, Low, Poor
B) Google does not reveal the Quality Score as it is proprietary information.
C) 1 to 100
D) 1 to 10