Answer:
C "Hence, more schools should follow the trend of starting later in the morning if they want to see improved test scores, greater attendance numbers, and, most importantly, healthier, happier teens."
Explanation:
I doubted it at first because it sounds too repetitive with sentence 13, but it makes more sense than the other options and relates to the argument and establishes a unified end as it summaries that more schools should have a later start time to help students succeed academically and improve their general wellbeing.
Direct object.
The direct object receives the action of a verb in a sentence.
The indirect object represents to whom or for whom something is said.
Ex: Sandra gave the book to Tom.
Sandra is receiving the action: she gives the book
Tom is the one getting the object
The answer is C I believe