Why Do Many Psycholinguists Refer to Toddlers' Speech as Holophrastic

Why do many psycholinguists refer to toddlers' speech as holophrastic?

A) The phrases children use are just words they have heard and do not convey any real message.
B) The children are attempting to express elaborate ideas with only a single word.
C) Early utterances are not meant to be communicative but only represent the child practising new vocabulary.
D) Children at this age are capable of successful communication only through gestures and other nonverbal means.