Well I think Romeo's mentality is "I'll do anything to be with you" kind of love
(like you know killing himself for Juliet)
Causes of absenteeism is minor illnesses ,mental health issues, and problems of your own at home
The answer to this Question is B.
It is a gerund. If we added the preposition 'by' like, 'by sprinting the gazelle outran...', we'd know better that prepositions, the case with 'by' for instance, went with gerunds.