$a , b$ and $c$ are real numbers with $a < b < c < 0$
Which of the following statements must be true?
I $a c < a b < a ^ { 2 }$
II $b ( c + a ) > 0$
III $\frac { c } { b } > \frac { a } { b }$
..... 10
$a , b$ and $c$ are real numbers with $a < b < c < 0$

Which of the following statements must be true?

I $a c < a b < a ^ { 2 }$

II $b ( c + a ) > 0$

III $\frac { c } { b } > \frac { a } { b }$