I think it's explanation since the text shows comparison which isn't direct, ni similar words are present, ruling out synonyms and examples aren't present in the text.
Hello
d)all of these are needed items
All of these are important you need to author's name to quote them, you need the title so readers know what you are researching, and dates of publication, so they know around the time this was published.
Hope this helps
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* Nosotras vamos a asistir a clase hoy.
(asistir a is its own word and has its own 'a')
what you were doing is "ir + infinitive" lol
This sentence places the object before the verb.
Freddie tried to stop the kitten that was scrambling wildly up the drapes