If a bacterium regenerates from an endospore that did not possess any of the plasmids that were contained in its original parent cell, the regenerated bacterium will probably also:

a) lack a cell wall.
b) be unable to survive in its normal environment.
c) lack water in its cytoplasm.
d) lack a chromosome.
e) lack antibiotic-resistant genes.

E) lack antibiotic-resistant genes.

Explanation:

It is plasmid which carries antibiotic-resistant genes in a bacteria so if the bacterium does not have plasmid then antibiotic resistant genes will also be absent in the newly regenerated bacteria.  

A plasmid helps in the survival of bacterium by providing defense against various antibiotics.

Bacterial plasmid is a structure which is circular and some plasmids apart from having antibiotic-resistant genes also participate in para-sexual reproduction in bacteria.