Which prefix means 'out, from, away'?

• A. in-, im-
• B. ab-
• C. ante-
• D. extra-

Answer: (B)

Thinking about prefixes that describe direction or movement, the one that cleanly means away from or off is ab-. This prefix comes from Latin and signals separation or departure, as seen in words like abduct (lead away), absent (away from here), and abnormal (not normal, away from the standard). The other prefixes don’t pin the sense of moving away as clearly: in- or im- usually means into or not; ante- means before; extra- means outside or beyond but not specifically away from something in the sense of removal or departure. So ab- is the best fit for “out, from, away.”