Every frugal shopper counts his or her coupons before they shop.
Explanation:
In the above sentence, the pronoun used would be 'his' or 'her' which would agree with the number of the antecedent. The antecedent is 'every frugal shopper' which is singular in number and hence, the pronoun used would be singular. The statement has a pronoun agreement error.
Evidence serves as support for the reason offered and helps compel audiences to accept claims. When someone haves a claim they must have an idea supporting that claim.