Question

what is a portable chair with arms and a backrest with the seat open like a toilet and a bucket under the seat?
required
a bedpan
b commode
c urinal

Explanation:

A commode is a portable chair with arms and a backrest, having an open - like - toilet seat and a bucket underneath for waste collection. A bedpan is a shallow pan used for urination or defecation while in bed (not a chair - like structure). A urinal is a fixed or portable receptacle mainly for men's urination (usually not in a chair form with the described features).

Answer:

B. commode