Which of the following best defines 'scurrilous' language?

The term 'scurrilous' is used to describe language that is vulgar, abusive, or slanderous, often aimed at insulting or disparaging someone. The correct answer reflects this definition accurately by indicating that such language is 'expressing offensive reproach.' Scurrilous language typically includes insults or defamatory statements that are intended to harm the reputation of individuals or groups. The context in which it is used generally suggests a lack of decorum or propriety, which aligns with the description of it being reproachful or offensive.

In contrast, the other choices describe language with positive connotations, such as being highly educational, encouraging and positive, or inspiring and thought-provoking, which do not fit the meaning of scurrilous. These options suggest constructive language that uplifts or educates, whereas scurrilous language is inherently negative and derogatory.