Multiple choice

That which cannot be solved.

Which is the correct option?

  1. Insoluble

  2. Optimist

  3. Soluble

  4. Opaque

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Insoluble means something that cannot be dissolved, solved, or resolved - like a problem with no solution. The prefix 'in-' means not. An optimist is positive, soluble means can be dissolved, and opaque means unclear - only insoluble means 'cannot be solved'.