The "universal truths" best supported by the ideas and events in "The Happy Mantoo" is too much of a good thing can make a person sick. Option C is correct.
A universal truth refers to a truth that is discernible by anyone or anything in any context. It is a truth aknowledged and embraced by everybody.
For instance, happiness and love can be considered universal truths.
And the story the Happy Man digs deeper about what makes happy a human being and other universal truths.
An obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English <span>lan-guage. Hope i helped </span>