Text
There is a sharp line between us and the other animals. In fact, the evolution of the human mind has been so different that there is a cognitive gap between us and our evolutionary relatives. As the only animal species, we have language, an attainment to which we owe our rule in the animal kingdom, and moral sense.
Statement
Humans owe their dominance over the other species to language
Answer
True. It says in the text that language is an attainment to which we owe our rule in the animal kingdom. The proposition is formulated slightly differently from the relevant fragment in the text, but rule in the animal kingdom should be understood in this text as dominance.