Explanation:

- When a translator is not proficient in two languages, it creates a semantic barrier.

- Semantic Barrier: This involves misunderstanding due to language or interpretation differences. It occurs when meaning isn't correctly conveyed.

- Physical Barrier: Involves tangible obstacles like distance or environmental factors affecting communication.

- System Barrier: Related to issues with communication channels or mediums, such as technical glitches.

- Psychological Barrier: Emotional factors affecting communication, like anxiety or mistrust.

- None of Above: Not applicable since semantic barriers are most relevant here.

Your Answer: Option 2 - Semantic