superintendent of schools: we should replace the smith publishing textbooks with the jones and company textbooks. assistant superintendent: why? superintendent of schools: because it takes 31 percent more time for teachers to prepare lessons using the smith publishing textbooks than it takes for teachers to prepare lessons using the jones and company textbooks. this time would be better spent on direct work with students. assistant superintendent: that is not a sufficient reason to change textbooks. we can simply hire teachers who already have planned lessons based on the smith publishing textbooks. which of the following, if true, most seriously undermines the assistant superintendent's objection to the argument made by superintendent of schools?