This would not make sense in any of the other answer choices because a gloomy mood would show darkness.Violent would be fighting.While lonley would be WAYYYY different . So welcoming would be best in this question.
The word that has the most negative connotation is ( D ) know-it-all. It means that a person described as a "know-it-all" is someone that thinks he/she knows more than other people about a particular topic or field. This person is not considered an expert by others.
Its because you can get answers from different students who have different points of view and knowledge so that students can share there answers and questions and find students with similar and different answers.
SO STOP HAAAAATINNNNNNGGGG (i know your not hating btw)