Achild who says, “give cookie,” rather than “will you give me a cookie? ” is demonstrating
a. underextension
b. telegraphic speech
c. overregularization
d. fast mapping

B. telegraphic speech

Telegraphic speech is demonstrated by a child who says, “Give cookie,” rather than “Will you give me a cookie?”

B

Explanation

Telegraphic speech is the mode of use of simple language with content words being most important to express ideas or needs.

This language is acquired by kids during the second year of a child's life.  

The name is taken from 'Telegram' as telegram was used to convey ideas with limited words, as to reduce cost.  

The use of determiners, conjunctions and propositions are excluded in a telegraphic speech.

explanation:

would it be plagiarism to copy and paste off of here? ?