Step-by-step explanation:
The main factor is a denotes to indefinite thing and the denotes to definite thing
Take an example
We can't right a Burj Khalifa as Burj Khalifa is one and only in the world.
Same thing applicable in sentences
Answer:
A is singular and talks about something in first person. The refers to something in 3rd person. The can also relate to a group of things while A refers to singular
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