Paragraph: There are some deposits of nitrates and phosphates in...

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1. Abetween $\mathrm{NH}_3$ and $\mathrm{PH}_3, \mathrm{NH}_3$ is a better electron donor because the lone pair of electrons occupies spherical 's' orbital and is less directional
2. Bbetween $\mathrm{NH}_3$ and $\mathrm{PH}_3, \mathrm{PH}_3$ is a better electron donor because the lone pair of electrons occupies $\mathrm{sp}^3$ orbital and is more directional
3. Cbetween $\mathrm{NH}_3$ and $\mathrm{PH}_3, \mathrm{NH}_3$ is a better electron donor because the lone pair of electrons occupies $\mathrm{sp}^3$ orbital and is more directional
4. Dbetween $\mathrm{NH}_3$ and $\mathrm{PH}_3, \mathrm{PH}_3$ is a better electron donor because the lone pair of electrons occupies spherical ' $s$ ' orbital and is less directional