To retain a newly introduced nonsense syllable in our working memory,it is most clearly necessary to engage in

A) chunking.
B) shallow processing.
C) rehearsal.
D) automatic processing.

Rehearsal involves repeating or practicing information in order to keep it in our working memory. This is likely the most effective strategy for retaining a newly introduced nonsense syllable in our working memory. Chunking (A) involves grouping information into meaningful units, but it may not be as helpful for retaining nonsense syllables. Shallow processing (B) involves attending to only superficial features of information, such as its physical appearance, and is not likely to be helpful for retaining information in working memory. Automatic processing (D) refers to processing information without conscious awareness, which may occur for some types of information but is not a deliberate strategy for retaining information in working memory.