The answer I believe is c.secondary
C. H<span>ow hard a person works to do an activity.
Intensity has to do with effort. If a person works hard than they are intense, if vise versa than they are not intense.</span>
Gathering information and data, since it refers to the key word: <em>timeline</em>.
Look at a picture and directions of correct posture, then com[are yourslef to it
:)
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