Students mix two liquids in a beaker and listed their observation

Liquid one was colorless
Liquid two was colorless
The mixture of liquid one and liquid two formed a colorless solution
Small solid particles formed and fell to the bottom of the beaker
Based on these observations, which statement contains the best evidence that a chemical reaction occurred
There is a change in shape
There is a change in
The two liquids mixed into a solution
The two liquids formed a new substance

The two liquids formed a new substance, evidenced by the small solid particles formed and falling to the bottom of the beaker.