Selena's right hemisphere is damaged. Selena is LEAST likely to experience difficulty with:

When the right hemisphere of the brain is damaged, it can lead to various difficulties in different areas. Let's analyze each option to determine which one Selena is LEAST likely to experience difficulty with.

Option A: Fine-tuning speech involves the coordination of various motor movements and the ability to produce fluent and accurate speech. Since the right hemisphere is responsible for the production of prosody (intonation, stress, and rhythm), Selena may experience some difficulty in fine-tuning her speech.

Option B: Perceptual tasks, such as recognizing faces, objects, and spatial relationships, are primarily processed by the right hemisphere. Therefore, Selena is likely to experience some difficulty with perceptual tasks.

Option C: Self-awareness is a complex cognitive process that involves introspection and understanding one's own thoughts, emotions, and behaviors. While the right hemisphere is involved in self-awareness to some extent, it is not the primary region responsible for this function. Therefore, Selena is LEAST likely to experience difficulty with self-awareness.

Option D: Mathematical computations primarily rely on the left hemisphere of the brain, which is responsible for logical reasoning and analytical thinking. Since Selena's right hemisphere is damaged, she may still be able to perform mathematical computations without significant difficulty.

Based on this analysis, the option that Selena is LEAST likely to experience difficulty with is C.