Answer: Option (A) is the correct answer.
Explanation:
Density is defined as mass per unit volume. Basically it is the degree of compactness which means how closely particles are combined together.
When we increase the temperature of a liquid, then particles of liquid start to move vigorously. As a result, there will be more number of collisions between the particles. Hence, they will move far away from each other.
Therefore, there will be decrease in density. Now, due to change in temperature there is change in density.
Thus, we can conclude that independent variable is the temperature, and the dependent variable is the density.
