The appropriate action to take during an asthma attack among the options provided is:
c) Eliminating any asthma triggers, if possible.
While options a) and b) might be relevant in certain contexts, they are not typically part of immediate care during an acute asthma attack (preventer medications are not taken during the attack and epinephrine is more related to severe allergic reactions rather than asthma). Option d) is also not a recommended position for someone experiencing an asthma attack. Instead, the person should be seated upright to help with breathing. Thus, removing triggers is the best immediate step if feasible.