I believe it's A. To support the declaration with the rest of their lives
Answer:
First of all, words have to types of meaning, denotation and connotation. A connotation, like this case, refers to the ideas or feelings in a word valued by people. So, is the meaning that ''suggest'' the word.
In this case, pioneer are labeled as such by people, involves values and ideas, like referring to someone that initiated a movement or experiment by a first time.