Multiple choice general knowledge

The 'A' series refers to sizes of paper like A3, A4 etc. What series describes the envelopes or folders that will enclose the A series?

  1. C

  2. E

  3. A

  4. B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The ISO 216 paper size system uses A series (A4, etc.) for paper and C series (C4, C5, etc.) for envelopes designed to fit A series paper. For example, a C4 envelope perfectly fits an unfolded A4 sheet. The B series exists but is for different purposes. Option A (C series) is correct.

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