Answer:
The second choice. Softly moving color.
Still in the 21st century there still people that are highly judgemental on someone ethnicity or/and race. Therefore race and ethnicity is affected by society as people will judge from where you came from or your skin colour
D. Air pollution is not as much of a problem there
The independent variable is the temperature.
The study aims to assess how the temperature level affects another variable, that, in turn, will be the dependent variable: the mood of the participants. The aim of the study is to conclude whether it is possible or not to infer causality between those two, in other words, to see whether different levels of temperature (<em>the cause</em>), trigger the emergence of a certain type of mood <em>(the effect).</em>