Adding graphic design to a t-shirt is an example of art for a. emotional resonance. b. commemorating a historical event. c. playfulness and decoration. d. sensuality.

A. emotional resonance.

Typography or texts, symbols, and photographic illustrations, or combination of these are used in graphic designing; which tells something or generates an idea that creates an impact or influence on readers by evoking their emotions, causing emotional resonance.

It can be both A and C
A because if you are trying to get your voice out there then t-shirts are an easy idea to make it public
C because people can just enjoy designing and selling clothes. It also looks good as well

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"