A Contract for the Sale of Business Often Includes Several

A contract for the sale of business often includes several alternative restraint of trade clauses,such as 'for three years and five kilometres' or 'two years and three kilometres' etc.The buyer inserts these alternatives because:

A) courts cannot alter the wording of a restraint of trade clause.
B) courts have the power to choose the most reasonable clause and to 'sever' (cut) the others.
C) courts require this type of contract to offer at least two alternative restraint of trade clauses.
D) all of the above are correct.
E) A & B only are correct.