Question

which solution would most likely cause a plant placed in it to become firmer and more rigid? osmotic isotonic hypotonic hypertonic

Explanation:

In a hypotonic solution, the solute concentration outside the plant cell is lower than inside. Water moves into the cell by osmosis, causing the cell to swell and become turgid, making the plant firmer and more rigid. In an isotonic solution, there is no net water movement. In a hypertonic solution, water moves out of the cell, causing it to shrink. "Osmotic" is a general term related to osmosis and not a type of solution for this context.

Answer:

C. hypotonic