That answer is because of pre-history if the question asks why it is valuable it is because of rather how long it has existed and what time remnant it existed in.<span />
Answer:
The answer is D.) Sensors
1. Complimentary
- use the colour wheel to identify colours directly across one another
2. Analagous
- use the colour wheel to pick out colours that sit right next to each other
Although I'm not sure, I do believe it is "Delphic Sibyl". Good luck!