Question

Use conjunction , The necklace was expensive because my mother didn't let me buy it. it is correct.

Answer 1

Answer:

the necklace was expensive as my mother didn't let me buy it.

Answer 2

Answer:

The necklace was expensive, so my mother didn't let me buy it.

Explanation:

It would be grammatically incorrect to use because or as in the middle, because that would change the meaning of the sentence. Instead it would mean that Your mother didn't let you buy the necklace, and that led to it becoming expensive.

You could also write:

Since the necklace was expensive, my mother didn't let me buy it.

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