Diamond rubies and Coral are the precious jewels , what is the noun of this sentence?​

Question 19 of 202 pointsread this passage: a longer school day might prove troublesome for the manystudents who need more time to complete all theirhomework and also participate in extracurricular activities.which word could best replace the word troublesome without changing theoverall meaning of the passage? o a. easyo b. challengingo c. hedeld. impossible