The usual order of the development of spoken language in an infant is:

A) cooing,babbling,reflexes,and spoken words.
B) reflexes,cooing,babbling,and spoken words.
C) babbling,cooing,spoken words,and reflexes.
D) cooing,reflexes,babbling,and spoken words.

According to research on language development in infants, they first exhibit reflexes related to feeding and vocalization. After this, they begin to coo and make other vowel-like sounds. Next, they start babbling, which involves repeating consonant-vowel pairs (e.g. "ba-ba-ba" or "ma-ma-ma"). Finally, they begin to produce their first spoken words. Therefore, the correct order is reflexes, cooing, babbling, and spoken words, which is reflected in option B.