Question

but the vote signals growing activism among leadership of churches on the issue of climate change.
source: the guardian
in the sentence above, activism has the same or almost the same meaning as:
lenience
skepticism
rationalization
involvement

Explanation:

1. "Lenience" means mercy or tolerance, unrelated to taking action on an issue.
2. "Skepticism" means doubt, which is the opposite of engagement.
3. "Rationalization" means justifying actions, not active participation.
4. "Involvement" means active participation in a cause, which matches the meaning of "activism" in the context of church leadership acting on climate change.

Answer:

involvement