When Jill Began Working as an Electrician for Bob She

When Jill began working as an electrician for Bob she signed a contract that prohibited her from commencing her own electrical business for 10 years from the date she left his employment.Two years after leaving Bob,Jill started her own business that competes with Bob.If Bob took action against Jill a court would probably rule that:

A) Jill is in breach.She should close down her business or pay damages.
B) Jill is not in breach.The contract of employment had no effect once she stopped working for Bob.
C) the clause was an unreasonable attempt to restrict competition,and therefore cannot be enforced.
D) the clause was unreasonable but it is binding because Jill signed the contract.