Which prefix means through, across?

• A. Trans-
• B. Post-
• C. Sub-
• D. Bi-

Answer: (A)

The meaning being tested is prefixes that indicate movement through or across. The prefix that conveys that sense is trans-, as seen in words like transmit (send across), transfer (move across), and transparent (allowing light to pass through). The other options don’t fit this idea: post- means after, sub- means under, and bi- means two. So trans- is the correct prefix for “through, across.”