Answer: Option B
inventors : a person who invented a particular process or device or who invents things as an occupation.
explorers : a person who explores a new or unfamiliar area.
colonialist : a person who supports the practice of gaining political control over other countries and occupying them with settlers.
settlers : a person who moves with a group of others to live in a new country or area.
pioneers : a person who is among the first to explore or settle a new country or area.
Synonym of pioneers is explorers