若a＜0，则下列不等式成立的是（　　）

A：$2a>{\left(\frac{1}{2}\right)}^a>{\left(0.2\right)}^a$

B：${\left(\frac{1}{2}\right)}^a>{\left(0.2\right)}^a>2a$

C：${\left(0.2\right)}^a>{\left(\frac{1}{2}\right)}^a>2a$

D：$2a>{\left(0.2\right)}^a>{\left(\frac{1}{2}\right)}^a$