$\begin{array}{1 1} (a)\; \text{pollination, fertilization, seedling, embryo} \\ (b)\; \text{seedling, embryo, pollination, fertilization} \\ (c)\; \text{pollination, fertilization, embryo, seedling} \\ (d)\; \text{embryo, seedling, pollination, fertilization } \end{array}$
