Cat urine. May sound weird, may get it wrong, but it's true. Your teacher'll freak out.
Answer=4
Only solids can create regular geometric patterns... CO2 is a gas, H2O is a liquid and Sodium Chloride doesn't count because it's dissolved in a solution...
I think thats the answer but feel free to check my work
Answer:
I think it's D one. Because all others are wrong