Will mark brainiest if right I know I answered B that was the most like I don’t know if that was the answer

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

Having a hard time understanding this question (see attachment).