Final answer:
Young Svetlana may have a communication disorder known as stuttering, which is characterized by the repetition of sounds or syllables in speech.
Step-by-step explanation:
Young Svetlana's repetition of sounds or syllables when speaking suggests that she may have a communication disorder called stuttering, which is option a) in the question. Stuttering is a speech disorder characterized by the disruption of the normal flow of speech. It often involves repeating sounds, syllables, or words, as well as pauses or prolongations of sounds.