The solution is non-ideal, showing positive deviation from Raoult's Law.
The solution is non-ideal, showing negative deviation from Raoult's Law.
n-heptane shows positive deviation while ethanol shows negative deviation from Raoult's Law.
The solution formed is an ideal solution.
On mixing n-heptane and ethanol; strong interactions (ethanol H-bonding) are replaced by weak interactions. Hence, it is a non-ideal solution with positive deviation. Hence option A is correct.