What Was the Major Factor When Determining How to Standardize

Multiple Choice

What was the major factor when determining how to standardize how the world measures time by the Prime Meridian?

A) Where a country's capital was located
B) Train schedules
C) Agreements made at the Rome conference for International Geographers in 1875 and International Meridian conference in Washington,D.C. in 1884
D) Great Britain paid a large sum of money.