Many factors make the difference between a vegan and a non-vegan. The principal reason why some people choose each type is health, environmental, and ethical, etc. Can anyone help me see this sentences have grammar mistakes?

Read the example sentence and study the chart of definitions. our vacation was ruined by the tediousness of the daily group activities, all of which seemed too much alike. given that the greek word root mono means "one” or "single,” which word could replace tediousness? a.monopoly b.monolith c.monotone d.monotony