The Reign of Terror was a period during the French Revolution characterized by extreme violence and suppression of opposition. Option 1 states that the Jacobins eliminated the Girondists with the support of the sans-culottes. This statement is correct because the Jacobins, under the leadership of Maximilien Robespierre, did indeed purge their political rivals, the Girondists, in order to consolidate their power.

Option 2 suggests that the Jacobins were aligned with the French clergy. This statement is also correct. During the Reign of Terror, the Church in France was subjected to significant control and reform, with many priests and bishops being forced to swear loyalty to the new revolutionary government.

Option 3 claims that the arrest for anti-revolutionary activities was limited to the political class only. This statement is not correct. The Reign of Terror was characterized by widespread repression, and anyone suspected of being counter-revolutionary, regardless of their social or political class, was at risk of arrest and execution.

Option 4 correctly states that the Reign of Terror ended with the execution of Robespierre by guillotine. Robespierre, who had been the driving force behind the Reign of Terror, fell out of favor with other revolutionaries and was ultimately sentenced to death.

In conclusion