Respuesta :
The correct answer is option A, that is, the vinegar solution was hypotonic, causing the egg to gain mass.
A hypotonic solution refers to any kind of solution, which exhibits a lower osmotic pressure than another solution. In biology terms, this usually means a solution that exhibits less solute and more water in comparison to another solution. Â
In the given case, the egg is placed in vinegar (a hypotonic solution), thus water will get inside the egg making the egg to gain mass. Â