Answer:
a fear appeal.
Explanation:
The term fear appeal in psychological context motivates people to obtain a particular behavior by arousing a feeling of threat or fear. In case of a fear appeal, threat is used to stimulate fear arousal and a particular action is taken in reducing the state of fear. It appeals to a vulnerable threat but does not suggest a solution or a protective measure.
Martha in the above case, used fear appeal to motivate the Congress to take action for a potential threat or risk.