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A.

Explanation:

'What trick-or-treating tells us about human nature ' is an article written by behavioral scientist, Dilip Soman. The article talks about how halloween gives behavioral scientists an insight into human behavior.

In first four paragraphs, Soman describes why behavioral scientists, like him, like Halloween. The behavioral scientists, as stated by Soman, are constantly seeking ways to study human behavior and choices made in natural environment. So, for them, Halloween is that natural habitat in which they study human conduct.

Therefore, option A is correct.

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.

answer: hey wheres the picture for this, chat with me if u want

explanation: