The correct options are
B Diagonals in a parallelogram bisect each other.
C A diagonal in a parallelogram divides it into two congruent triangles.
i) A parallelogram has 2 diagonals.
ii) The diagonals are unequal in a parallelogram.
iii) The diagonals bisect each other.
iv) A diagonal in a parallelogram divides it into two congruent triangles.