Here is a goal: How can I relax if I am feeling particularly anxious?

Which way makes more sense to accomplish this goal?

Choices:
[a]. Watch a suspenseful movie you have seen before, the predictability of it is scientifically proven to lower your stress levels.;
[b]. Watch a favorite movie you have seen before, the predictability of it is scientifically proven to lower your stress levels.;
[b].