Concept:Mother tongue is the first language learned naturally from birth. Acquisition begins with listening to caregivers before speaking or writing.Explanation:Infants and young children acquire their mother tongue primarily by listening to the language spoken around them. They absorb sounds, words, and sentence patterns through constant exposure. This listening builds receptive language skills, vocabulary, and grammar understanding.Speaking develops later, after enough listening and internalization. Formal learning and writing are secondary; they come after basic spoken language is already acquired. Writing is taught at school, not the starting point. Therefore, the foundation of mother tongue acquisition is listening.Answer:C. by listening to it