Which revision of the following sentence best maintains the formal tone appropriate for an academic essay: 'The study's results were kinda interesting, I guess.'
Correct: C
Option C maintains a formal tone by using 'somewhat' to replace 'kinda' and omitting the informal phrase 'I guess'. 'Seemed interesting' is too vague. 'Quite interesting' and 'I suppose' retain some informality. 'In my opinion' is unnecessary and weakens the statement in academic writing.