What is the best replacement for the underlined word in the sentence below?
unlike toxic sea serpents, there is no known antivenin that can save those bitten by a blue-ringed octopus.
a. effect
c. antitoxin
b. measurement
d. doctor

Explanation:

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.

the whisper is the answer, hope this : )