If j and k are intersecting lines, a and b are points on j, and c and d are points on k, how many planes contain points a, b, c, and d?

a. infinitely many
b. we can't determine from the given information.
c. exactly one
d. none

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.