Final answer:
The Mongol Empire expanded from the Pacific Ocean to Eastern Europe after Genghis Khan's death, though they did not invade Western Europe.
Step-by-step explanation:
Even after Genghis Khan died, the Mongol Empire expanded significantly and reached vast territories, creating the largest contiguous land empire in history. The correct answer to the statement is from the Pacific Ocean to Eastern Europe. This expansion includes the conquering of regions that were not under Mongol control during Genghis Khan's lifetime, such as the Middle East and China, extending their reach to the edges of Western Europe, but never fully invading it.