Question

why is the liquid more dense when sugar was added?
increase mass = decrease density

increase mass = increase density

rewatch

Explanation:

Density is defined as $
ho=\frac{m}{V}$, where $m$ is mass and $V$ is volume. When sugar is added to a liquid, the mass of the liquid - sugar mixture increases, while the volume change is relatively small (often negligible or small enough that the increase in mass dominates). From the density formula, if mass ($m$) increases and volume ($V$) remains approximately constant, density ($
ho$) will increase. So the correct statement is "increase mass = increase density".

Answer:

B. increase mass = increase density (assuming the second option is labeled as B, if we consider the first option as A and the second as B. If the options are just the two statements, the correct one is "increase mass = increase density")