What is a counterexample for the following conjecture? If a counterexample does not exist, chose not possible.
Conjecture: All quadrilaterals are rectangles
a. a trapezoid is a quadrilateral, and it is not a rectangle
b. all quadrilaterals are not rectangles
c. a triangle is not a quadrilateral, and it is not a rectangle
d. not possible

Question

What is a counterexample for the following conjecture? If a counterexample does not exist, chose not possible. 
Conjecture: All quadrilaterals are rectangles
a. a trapezoid is a quadrilateral, and it is not a rectangle
b. all quadrilaterals are not rectangles
c. a triangle is not a quadrilateral, and it is not a rectangle 
d. not possible

kittiwitti1 · Answer

Hello again! lol

The answer is A because everything else just looks like stupid or obvious inferences.
(haha I mean that 'all quadrilaterals are not rectangles' is not a counterexample, it is simply stating a far too general fact)

anonymous · Answer

lol hey (: , you are a lifesaver , I've been stuck on alot of questions for 2 hours now . @kittiwitti1

kittiwitti1 · Answer

Give the credits to Ms Charlotte, she taught me how to be an awesome math helper ლ(́◉◞౪◟◉‵ლ)

(Lol I don't know if she's still on though. D:)

You're welcome though, feel free to keep asking questions (as long as I'm online I'll try to help lol!)

anonymous · Answer

lol I will , thank you so much.