Answer the question on the basis of passage given below :
There are some deposits of nitrates and phosphates in the earth’s crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under laboratory conditions, but microbes do it easily. Ammonia forms a large number of complexes with transition metals. Hybridisation easily explains the ease of sigma donation capability of NH₃ and PH₃. Phosphine is an inflammable gas, it is prepared from white phosphorus.
NH₃ is a stronger base than PH₃ because:

1. A Phosphorus is smaller in size than nitrogen
2. B Nitrogen is smaller in size than phosphorus
3. C PH₃ does not have lone pair of electrons
4. D NH₃ does not have lone pair of electrons