There is an organic silicide with the simplest composition called silane.

The answer is D. Judging directly from the periodic law of elements, the thermal stability of silane is worse than that of methane because the nonmetal of Si is smaller than that of C.

Everything else is right.

A the naming of organic alkanes similar to carbon can be compared with methane.

B.SiH4+2O2= (ignition/spontaneous combustion) SiO2+2H2O.

C. both C.SiH4 and CH4 are molecular crystals, and the higher the molecular weight, the higher the density.