Which conjunction is true?
a. an isosceles triangle has two congruent sides and a right angle. a square is a b. rhombus and a rectangle. a kite is rhombus and a parallelogram. a right triangle c. is isosceles and has two acute angles.

From the given, first state about the isosceles triangle is FALSE. Having two congruent sides should be enough to describe the isosceles triangle. The addition of the measure of the angle is not necessary. 
  A square is indeed a rhombus and a rectangle.
A kite is a rhombus but not a parallelogram.
A right triangle need not be isosceles but should have two acute angles. 

Thus, the conjunction that is true among the choices is letter B.