Fill in the blank in the sentence below with the most natural form of the word in brackets. The response is case sensitive.

An seller is waiting for customers at the markets. (onion)

An onion seller is waiting for customers at the market.

Explanation:

So according to the expectation of the question, the answer "onion", "o" is not capitalized.

Reason:

"Onion" is a noun. In simple terms noun represent "name, place, animal things".

So noun should be capitalized but it also depends on the type of noun. All the vegetable names, fruits name, etc comes under common noun.  

Example: cat, women, uncle

So, mostly common nouns are not capitalized.  

But Proper nouns are usually capitalized.

Example: Pacific Ocean, America

- "is not only a luminous passive watcher in the night sky, but it is a powerful force.

it does symbolizes love,   lust   and dreaming and is seen as a power symbolic force that determines and affects human behaviors and reactions.

in the context of the question it does remain you that he events are only taking place at night and the reader of the passage of time."