A good title for the timeline would depend on the specific content covered. However, if the timeline focuses on multiple significant events and developments in Asia, then A. Asian History would be the most encompassing and suitable title. If the timeline specifically emphasizes Buddha's life and teachings, then B. The Life and History of Buddha would be appropriate. Similarly, if it focuses solely on the Indus River Valley, then C. Indus River Valley History would fit best. If it covers the civilizations around African river valleys, then D. History of Africa's River Valley Civilizations would be the choice.
So, the ideal title hinges on the specific focus of the timeline.