Eric draws three parallelograms. he measures the sides of each figure, as shown in the attachment. which conjecture is reasonable for eric to make?

- The third option is the right answer" In a parallelogram opposite sides are congruent.

Explanation:-

A parallelogram is a simple quadrilateral whose opposite sides are parallel and  have equal length.The opposite angles of a parallelogram have equal measure.

Now,

First conjecture is wrong as in a parallelogram consecutive sides may not be equal ,if they are equal then it can be rhombus.Second conjecture is wrong as in a parallelogram opposite sides are equal.Third conjecture is true by the definition of parallelogram.Fourth conjecture is wrong as in a parallelogram opposite sides are parallel thus it cannot bisect each other.