Many who have attempted to climb Mount Everest have sacrificed their most valuable possession to the mountain their lives. Which punctuation mark should be placed after the word mountain? a comma a colon a semicolon a hyphen

The punctuation mark that should be placed after the word mountain is a comma. A comma is used in order to separate thoughts. Since in the sentence the subject that it is referring to is ‘their lives’ not immediately after the action word, it is necessary to use the comma for readers to not get confused what possession the people are sacrificing.