Connotation refers to the emotional or cultural associations a word carries, beyond its literal dictionary definition (denotation). While "thrifty," "frugal," "stingy," and "economical" all relate to managing money carefully, their connotations differ significantly.
Option C, "Stingy," has a different, negative connotation. While it denotes being careful with money, it implies an excessive unwillingness to spend or give, often to the point of meanness or selfishness. It suggests a negative character trait.
Options A ("Thrifty"), B ("Frugal"), and D ("Economical") generally carry positive or neutral connotations. "Thrifty" suggests being wise and careful with money, often implying good management. "Frugal" implies being economical and avoiding waste, often seen as a virtue. "Economical" simply means using resources efficiently or costing little. These words typically describe responsible financial behavior, whereas "stingy" implies a fault.