The correct answer is they show weak positive gram staining reaction.
Explanation:
<em>Mycobacterium phlei </em>is a rod-shaped species of the genus Mycobacterium. They are acid-fast bacteria with mycolic acids rich cell wall due to which gram stain cannot penetrate easily and show light purple color while staining.
When gram staining is performed on the <em>M.phlei </em>, they take light purple color which indicates that it is a gram-positive bacteria and is related to Actinobacteria phylum of the gram-positive bacteria.
Thus, <em>M. phlei</em> is a gram-positive bacteria.
