Reaching the Age of Adolescence

Given below are events that lead to pregnancy and development
of embryo.
(i) Fertilization of egg
(ii) Maturation of egg
(iii) Release of egg
(iv) Embedding of embryo in thickened uterine wall.
Which of the following options gives the correct order of sequence
in which they occur?
(a) i, ii, iii, iv, (b) ii, i, iii, iv (c) i, iv, ii, iii (d) ii, iii, i, iv.