I think C the answer would be C
Depends on what you're looking at. Colors seem to have a role in how we feel, out heart rate. But being able to look at calming scenery, of bright greens and blues is calming because it's the colors of life, and our minds sees the colors and we instantly become more calm. Green is calming because it's color that is found quite frequently in nature, so essentially it's good.<span />
In a study, the independent variable is the thing that you change to see how the change produces different results. In this study, the independent variable would be the use of nicotine.
It called the Pectoral muscles
