What was not a challenge to john f. kennedy's ethos for many americans? •his irish heritage •his being a world war ll navy veteran •his age •his being roman catholic

His being a World War ll navy veteran.

Explanation:

Although President John F. Kennedy is generally appreciated and celebrated nowadays, that was not the case when he was first a candidate. Kennedy had some qualities that many Americans did not approve of. His Irish heritage and his Roman Catholic religion alienated some Protestant Americans. Moreover, his age was considered a negative quality, as some people believed he lacked experience to govern. However, his being a World War II veteran was not seen as a negative quality, as Americans tend to appreciate the sacrifices veterans do for their country.

i think the answer would mist likely be an adjective clause, because unhappy is an adjective.