Al, an Accountant, Has a Tax Service and Accounting Business

Al, an accountant, has a tax service and accounting business in Redwood City.He decides to move to Center City, which is 150 miles away and sells his accounting practice to Able and Baker, a CPA firm.In the sale contract, he agrees that he will refrain from practicing accounting anywhere within a 100-mile radius of Redwood City for a period of two years.However, on weekends he returns to his house in Redwood City, and when clients call him, he meets with them in his home.In this situation:

A) Al is in violation of the sale agreement.
B) the agreement is invalid, because it is an illegal restraint on trade.
C) the agreement is illegal, because it is a violation of public policy.
D) the two-year provision is likely to be held invalid, because it is too long a period of time.