Which of the following must be true if b=x^5
I. b is positive.
II. x is non-negative.
III. If x is positive then b is positive.  Choose the correct option.
A) I only	B) II and III only	C) II only	D) I and III only	E) III only
I. b is negative --&gt; true   II. b is non-negative. b can take ANY value: positive, negative, zero. We don't have any restrictions on its value;   III. If x is positive then b is positive.   Answer: I and III only (I and III only).
<result>D</result>
Which of the following must be true if b=x^5
I. b is positive.
II. x is non-negative.
III. If x is positive then b is positive.