The correct options are
A Ex-nobles and members of the clergy were arrested and imprisoned.
D Churches were shut down and converted into government offices.
The period from 1793 to 1794 is referred to as the ‘Reign of Terror'. Robespierre followed a policy of severe control and punishment.
All those whom he saw as being ‘enemies’ of the republic, including ex-nobles, clergy, and members of other political parties, and those who disagreed with his methods, were arrested, imprisoned and then tried by a revolutionary tribunal. If the court found them ‘guilty’, they were guillotined. Churches were shut down and their buildings converted into barracks or offices.