Answer:
C. Radius
Explanation:
A segment which starts at the center of the circle and an end at a point on the circumference is called radius of the circle.
Count change of signs to tell positive roots
then replace x with -x and evaluate, then count change in sign for negative roots
initially
+, -, -, +, +, -
3 changes
3 or 1 positive roots
replacing x with -x
-,-,+,+,-,-
2 changes
2 or 0 negative roots
B is answer
