If this is a true or false question then it is true.
The correct answer is "the universal topic". Universal topics are non specific themes which can be the main focus of an essay for example, "food", "animals", "friendship", "love", among other. Nonfictional works could be focused of any universal topic, and the author's purpose by writing the work is to elaborate in this topic with her or his readers.
This depends on the sentence given. Prepositions are words that associate an object to a certain location or position. Examples of prepositions are: on, after, below, by, during, and many more. If you want to use the word 'opportunities' as the object of your preposition, an example would be as follows:
Mary is hopefully praying for good luck as she takes on opportunities. The preposition is 'on' and the object of preposition is 'opportunities'.
Allowing farmers to sell fresh produce.
plural it is talking about multiple things