Learn English – Which is correct – “{When / As / Since / Whether} she was 18 years old, she entered the order…”

exam-questionsword-choice

Choose correct option and explain why?

___ she was 18 years old, she entered the order of the Sister of Our
Lady of Loreto, in India.

  1. When
  2. As
  3. Since
  4. Whether

Well, All we know that the "Whether" is unrelated but from the book perspective, "When" is correct option. I couldn't understand? why not "As"?

Additional info:

It was one of the Konkour questions.

Konkour (Persian: کنکور; from the French Concours), is a standardized
test used as one of the means to gain admission to higher education in
Iran.

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As you see, we don't have extra context for the question (not before and not after.), every question is independent.

Best Answer

as in its temporal sense relates to a coinciding event, something that happens at the same time as something else:

He took off his coat as he entered the room.

Temporal as is synonymous with while (but note, as he entered would be better paraphrased as while he was entering).

as in its causal sense refers to a condition that makes something possible, or to an explanation for something.

She was able to vote, as she was now 18 years old.

They took the car to the repair shop, as it was making a noise.

Causal as is synonymous with since.

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