If the cost price of 10 articles is equal to the selling price of 7 articles, then the gain or loss percent is:

1. $$51 \%$$ gain
2. $$42\cfrac{6}{7} \%$$ gain
3. $$35 \%$$ loss
4. $$42\cfrac{6}{7} \%$$ loss

A

1

B

2

C

3

D

4