One way in which robespierre and napoleon are similar is that they both a) they both played an important role in the conquest of vienna b) increased their power during the french revolution c) were executed for treason by french monarchs d) led armies against the haitians

B) increased their power during the French Revolution

Explanation:

Napoleon I Bonaparte was a French military man and statesman, Republican general during the Revolution and the Directorate, architect of the coup d'etat of 18 Brumaire which made him the first consul (Premier Consul) of the Republic on November 11, 1799; consul for life from August 2, 1802 until his proclamation as emperor of the French (Empereur des Français) on May 18, 1804, and was crowned on December 2; He was proclaimed King of Italy on March 18, 1805 and crowned on May 26. He held both titles until April 11, 1814 and, from March 20 to June 22, 1815. Maximilien François Marie Isidore de Robespierre, was a lawyer, writer, speaker and French politician nicknamed «the Incorruptible». He was one of the most prominent leaders of the French Revolution, deputy, president of the National Convention on two occasions, undisputed leader of the most radical faction of the Jacobins and member of the Committee of Public Salvation, entity that governed France during the known revolutionary period as the Terror.