Select the option that can be used as a one-word substitute for the underlined group of words.

The rich man was known all throughout the country for his noble deeds, kindness and as one who makes an active effort to promote human welfare.

Philanthropist

A "philanthropist" is a person who seeks to promote the welfare of others, often through charitable acts or donations. They are known for their noble deeds, kindness, and active efforts to improve human welfare. In the given group of words, "the rich man known for his noble deeds, kindness, and efforts to promote human welfare," the word "philanthropist" accurately represents the individual's characteristics and actions.

"Squanderer" refers to someone who spends or wastes money or resources recklessly and extravagantly. It does not capture the notion of actively promoting human welfare.

"Spendthrift" describes a person who spends money extravagantly and wastefully. It does not specifically encompass the aspect of promoting human welfare or engaging in noble deeds.

"Pacifist" refers to an individual who believes in the peaceful resolution of conflicts and opposes violence or war. While this is a positive quality, it does not capture the entire range of characteristics mentioned in the group of words.

Therefore, "Philanthropist" is the most appropriate one-word substitute for the underlined group of words as it directly represents a person who engages in noble deeds, kindness, and active efforts to promote human welfare through charitable acts and donations.