Which of the following best describes a person who is proficient at a task?

The term "proficient" refers to someone who is skilled and competent in a specific task or area. A proficient individual has acquired a level of expertise that enables them to perform their tasks effectively and efficiently. Being described as an expert suggests a high degree of mastery and knowledge, which aligns closely with the meaning of being proficient.

In contrast, the other options highlight attributes that do not fit this definition. Someone who is inexperienced lacks the necessary skills or knowledge, while a confused person may struggle with understanding or completing tasks. The term casual can imply a relaxed or indifferent approach, which does not necessarily correlate with skill or proficiency. Therefore, being proficient closely aligns with being labeled an expert, as both indicate a significant level of ability and confidence in performing a particular duty.