Which prefix means 'On the outside; beyond'?

• A. Con-
• B. Extra-
• C. Ultra-
• D. Intra-

Answer: (B)

Extra- expresses location outside or beyond, which fits the clue “on the outside; beyond.” It’s the common prefix in terms like extracellular (outside a cell) or extracorporeal (outside the body), signaling something situated outside or beyond the usual boundary. The other prefixes don’t convey that outside-or-beyond sense as directly: con- means with or together; intra- means inside; ultra- means beyond in degree or extreme, but not specifically outside.