which of the following must all graphs include? a legend for every data point a summary paragraph only…

Brief Explanations:

A title helps identify the graph's purpose, and labeled X and Y - axes with units make the data clear. A legend isn't always needed (e.g., for single - data - set graphs), a summary paragraph isn't a must, and the X - axis can have non - number labels (e.g., categories).

Answer:

D. A title, labeled X and Y axes with units