Final answer:
The highest temperature during summer in the Arctic tundra climate is approximately 12°C (52°F), indicating that option C (40 degrees) is the closest to the average summer high.
Step-by-step explanation:
When considering the summer temperatures in the Arctic tundra, geographers note that the average summer temperature ranges from 3°C to 12°C (37°F -52°F). The tundra climate experiences very short summers with almost 24 hours of daylight, which allows for rapid plant growth despite the low temperatures. Given this information, the highest that the temperature gets during summer in the tundra climate would be close to 12°C (52°F), as the Arctic tundra does not experience the extreme heat found in subtropical deserts or other climates.