Which of the following is NOT a level of Bloom's Taxonomy?

The correct answer is "Retention" because Bloom's Taxonomy consists of a hierarchical classification of cognitive skills that include levels such as Knowledge, Comprehension (which is often referred to as Understanding), Application, Analysis, Synthesis, and Evaluation. Each level builds on the previous one and represents different complexities of cognitive tasks.

"Retention" does not exist as a distinct level within Bloom's framework, although it relates to the broader concept of memory or recall in education. The focus of Bloom's Taxonomy is on the process of learning and applying knowledge rather than solely remembering information. This difference underscores why "Retention" is not a recognized level in the taxonomy, whereas the other options directly correspond to established cognitive processes defined by Bloom.