The correct answer is A. Discouraging.
Gloomy is an adjective that means “dark and depressing.” It can also mean “unhappy or pessimistic.”
Discouraging is an adjective that means “causing someone to lose confidence or hope.” It can also mean “to prevent someone from doing something.”
Disguising is an adjective that means “to hide or conceal something.” It can also mean “to make someone or something look different.”
Bright is an adjective that means “having a lot of light.” It can also mean “happy or cheerful.”
Tragic is an adjective that means “causing great sadness or sorrow.” It can also mean “very unfortunate.”
In the context of the question, the word “gloomy” is most closely related to the word “discouraging.” This is because both words have negative connotations and suggest that something is not going well. For example, a gloomy day is a day that is dark and depressing, while a discouraging experience is one that causes someone to lose confidence or hope.
The other options are not as closely related to the word “gloomy.” For example, the word “disguising” suggests that something is being hidden or concealed, while the word “bright” suggests that something is full of light. The word “tragic” suggests that something is very unfortunate, but it does not necessarily suggest that something is dark or depressing.