Number the events in chronological order

-Julius Caesar becomes Dictator of Rome
-Caesar conquers Gaul and most of western europe
-Octavian is crowned imperator, and the pax romana begins
-Caesar defeats Pompey and forms an alliance with cleopatra
-Caesar returns to Rome with his army and starts a civil war
-The Senate orders the assassination of Julius Caesar

1 -Caesar conquers Gaul and most of western europe

2.  Caesar returns to Rome with his army and starts a civil war

3. -Caesar defeats Pompey and forms an alliance with cleopatra

4.  -Julius Caesar becomes Dictator of Rome

5 -The Senate orders the assassination of Julius Caesar

6  -Octavian is crowned imperator, and the pax romana begins

Explanation:

1. Caesar conquered Gaul and most of western Europe 52 BC

2. Caesar returned to Rome with his army and civil war started, this when Julius Caesar and Pompey the Great went to war against each other. 49 BC

3. Caesar defeated Pompey at the battle of Pharsalus, then Pompey fled to Egypt and was killed by courtiers of Ptolemy XIII. Caesar later made alliance with Cleopatra. 48 BC

4. Julius Caesar names himself dictator of Rome 45 BC

5. The Senate ordered the assassination of Caesar. 44 BC

6. Octavian is crowned imperator. The Pax Romana begins 27 BC

im going to go with b.