In Which of the following infections ciprofloxacillin is least effective.. UTI due to pseudomonas aeruginosa

In Which of the following infections ciprofloxacillin is least effective:

A) UTI due to a beta- lactamase producing strain of klebsiella
B) Pneumonia due to to streptococcus pneumonia
C) UTI infection due to E. coli
D) UTI due to pseudomonas aeruginosa***