Select the best way to revise the following sentence to achieve gender-neutral, unbiased language while avoiding problems with pronoun agreement. an elementary school teacher may need to alert her students' parents about the presence of head lice. a. no change is needed; the sentence is fine as it is. b. an elementary school teacher may need alert students' parents about the presence of head lice. c. an elementary school teacher who realizes that one of her students has head lice may need to alert students parents to the problem. d. when an elementary school teacher realizes that a child has head lice, she may need to alert her students' parents to the problem.