How do three- to six-month-old children usually communicateA. In one-word sentences C. By cooing B. word strings comprised of two words D. three-or-more sentences?

Three- to six-month-old children typically communicate using word strings, which are combinations of two or more words that are not necessarily grammatically correct. These word strings often consist of a noun and a verb, such as "mama eat" or "baby play." This stage of language development is known as telegraphic speech.