Reproduction in Plants

Which of the following statements is/are true for sexual
reproduction in plants?
(i) Plants are obtained from seeds.
(ii) Two plants are always essential.
(iii) Fertilisation can occur only after pollination.
(iv) Only insects are agents of pollination.
Choose from the options given below.
(a) (i) and (iii) (b) (i) only
(c) (ii) and (iii) (d) (i) and (iv)