Which prefix means Through; b/w; asunder?

• A. Per-
• B. Dia-
• C. Macro-
• D. Bio-

Answer: (B)

Dia- is a prefix from Greek meaning through, across, or between. That range fits “through” and “across” very naturally, and it also conveys moving from one side to another or spanning a boundary—ideas that align with “asunder.” In medical terms you see it in diameter (a line through the circle) and diagonal (across a shape), illustrating crossing from one edge to another. The other options don’t carry that same flexible sense: per- can mean through but more often implies through or thoroughly in a way that emphasizes completeness; macro- means large; bio- means life. So dia- best captures through, between, and across/separation concepts.