What is the meaning of the idiom "A laughing stock"?

The correct answer is An object of ridicule. The idiom "a laughing stock" means someone or something that is made fun of or ridiculed. It is often used to describe people who have done something foolish or embarrassing, or who are considered to be incompetent or ridiculous.

The other options are incorrect. An object of desire means someone or something that is wanted or desired. Uncomfortable situation means a situation that is causing someone to feel uneasy or awkward. Stressful situation means a situation that is causing someone to feel anxious or overwhelmed.