What technique is Samantha using when she spells "rhinoceros" aloud 30 times?

Samantha is using rehearsal, which is a cognitive technique that involves repeatedly practicing or reviewing information to enhance memory retention. By spelling "rhinoceros" aloud 30 times, she is actively engaged in verbal repetition, which helps reinforce the neural pathways associated with that word. This technique is particularly effective for information that needs to be memorized in the short term, helping to keep it active in her working memory.

The other options involve different strategies for memory enhancement. The peg-word system is a mnemonic device that pairs numbers with words to facilitate memorization through associations. Chunking involves breaking down long strings of information into smaller, manageable units for easier processing. The method of loci is a visualization strategy that uses spatial memory to organize and recall information. While each of these techniques can be effective for learning, rehearsal is specifically characterized by repetitive practice, making it the correct answer in this scenario.