For persons who ear an amount of income such that the Earned Income Tax Credit (EITC) benefit is neither increased nor reduced as they work more, which statement is TRUE? O a. The effect of the EITC on labor supply is ambiguous. b. The EITC does not have an income effect. O c The EITC does not have a substitution effect. ed. The effect of the EITC is to increase labor supply