10. How did Caesar become sole ruler of Rome? a. He killed the other two members of the Triumvirate. b. Crassus was killed in battle. Then, Caesar won a civil war against Pompey. c. He was elected. d. He inherited his power.

To determine how Caesar became the sole ruler of Rome, let's analyze the options provided: a. **He killed the other two members of the Triumvirate.** - This is not accurate. While Caesar did have conflicts with other leaders, he did not kill both members of the Triumvirate. b. **Crassus was killed in battle. Then, Caesar won a civil war against Pompey.** - This is the correct answer. Crassus was indeed killed in battle in 53 BC, which weakened the Triumvirate. Following this, tensions escalated between Caesar and Pompey, leading to a civil war. Caesar ultimately defeated Pompey, which allowed him to consolidate power and become the sole ruler of Rome. c. **He was elected.** - While Caesar held various political offices, he did not become the sole ruler through a standard election process. d. **He inherited his power.** - This is incorrect as Caesar did not inherit power in a traditional sense; he rose through military and political means. Based on this analysis, the correct answer is **b. Crassus was killed in battle. Then, Caesar won a civil war against Pompey.**