Not sure about number three in regards to the literary movement; however, i can help you with the last two.
"the collars belonging to the cats" -- there are multiple collars, and multiple cats. the way to represent this is "the cats' collars." you add the apostrophe to the cats, because the multiple cats own the collars.
"the notebooks belonging to Janet" -- here, you have multiple notebooks, but only one janet. the way to show this is "Janet's notebooks." the possessive s is added to janet's name to show that the notebooks are hers. the possessive s or apostrophe would not apply to notebooks, because the notebooks don't own anything. only janet owns something.
Answer: C
Explanation: the sentence makes sense without the whom
It is the deliberate killing of a large group of people, especially those of a particular ethnic group or nation.
Answer:
Irregular
Explanation:
You can think of "regular" as several neat rows or many similar things. They are all "regular" with each other and you can sort of predict what will come next.
There does not seem to be a specific pattern here, so we can conclude the answer most likely is irregular.