A person with prolonged usage of contact lenses presented with irritation of left eye.After examination a diagnosis of keratitis was made and corneal scrapings revealed growth of pseudomonas aeroginosa. The bacteria were observed to be multidrug resistant. Which of the following best explains the mechanism of antimicrobial resistance in these isolated pseudomonas aeroginosa strains

• A. Frequent and injudicious use of topical antibiotics
• B. Ability of Pseudomonas to produce biofilms
• C. Ability to transfer resistance genes from adjacent commensal flora
• D. Improper contact lens hygiene