Answer:
It should be the A (I may be incorrect)
Explanation:
source: https://www.industrial-electronics.com/Electricity-Refrigeration-Heating-Air-Conditioning_5b.html
find with keyword: (cmd f or CTRL f)
Fig 26 Symbols for heating and cooling thermostats: Heating thermostat; opens on temperature rise; Cooling thermostat; closes on temperature rise
hope that helps
