A. Red — is the most emotional colour, causing a faster heartbeat and breathing. It is also the color of love. Since it is an extreme colour, red might not help people in negotiations But decorators say that red helps create a happy atmosphere that is perfect for social gatherings.

B. Blue — The colour of the sky and the ocean, blue is one of the most popular colours. Peaceful and relaxing, blue causes the body to produce calming chemicals, so it is often used in rooms in order to reduce stress and rest.