I assume your choices are either social, informal, or business? I think it's social... it's definitely not business, and it doesn't sound informal.
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.
Answer:
A thesis statement is the main idea of an essay. It consists of the topic of the essay and the writer's claim about the topic that will be proven throughout the essay.
Explanation: