Final answer:
The correct way to write the underlined part of the sentence is: Russia, Canada, and China. This answer follows the proper punctuation and capitalization rules when including a list of countries.
Step-by-step explanation:
The correct way to write the underlined part of the sentence is:
Russia, Canada, and China
This answer follows the proper punctuation and capitalization rules when including a list of countries. The words are capitalized since they are proper nouns, and a comma is used to separate each item in the list.