The finding that infants pay attention to the speaker's intentions when interpreting the meaning of the speaker's words supports the importance of in language development

The answer that best fits the blank is this: a language-specific learning module. For infants, they interpret such words which are spoken by the speaker based on a specific language learning module. Infants have their own way of interpreting and usually this is based on the intention of the speaker.

D. Length of time needed for a goal