Which discipline has a particular year as its start date? a. Philosophy b. Geography c. History d. Economics

The appropriate answer to this question is c. History.

History as a discipline is commonly marked by specific events or periods that define its beginning. For example, many historians consider the year 4000 BCE, when writing and recorded history began, as a significant starting point for the discipline. Different areas of history might begin at different points, but the general consensus places historical studies in a context that is often tied to discrete events rather than the more fluid development of subjects like philosophy, geography, or economics.

In essence, while all disciplines evolve and have historical roots, history uniquely denotes these roots through specific dates and events that signal the commencement of recorded human activity and analysis.