Edo not know for certain whether the general trends we observe in stellar birth masses also apply to brown dwarfs. but if they do, then which of the

If we do not know for certain whether the general trends we observe in stellar birth masses also apply to brown dwarfs, the correct statement would be: do not know for certain whether the general trends we observe in stellar birth masses also apply to brown dwarfs
Brown dwarf's size tend to be significantly smaller compared to ordinary stars and it has longer period of life

The answer would be false.