What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: It is late. If Barbara were excited, then Sarah is drinking water. If Elisabeth reads a book, then Barbara is excited. Sarah is not drinking water.
Barbara is not excited can be inferred via the modus tollens rule. If Elisabeth reads a book, then Sarah is drinking water can be inferred via the transitivity rule. It is late and Sarah is not drinking water can be inferred via the conjunction rule. Sarah is not drinking water and it is late can be inferred via the conjunction rule.