Question SPL - Sailplane Pilot License - Meteorology

302 - SPL - What change in thermal activity may be expected with cirrus clouds coming up from one direction and becoming more dense, blocking the sun?

Cirrus clouds may intensify insolation and improve thermal activity

Cirrus clouds indicate an high-level inversion with thermal activity ongoing up to that level

Cirrus clouds prevent insolation and impair thermal activity.

Cirrus clouds indicate instability and beginning of over-development