In the midst of a growing environmental crisis, Alex decides to take a bold step for the urgent need for climate action by climbing into a $500$ year old oak tree that is set to be cut down. Alex nearly falls from the tree and narrowly escapes injury or possible death. It is clear that Alex has subjected herself to great risks, yet the tactic works and the tree still stands today.

Which term best describes Alex's strategy according to Engler and Engler?

Agitation

Disruption

Sacrifice

Escalation