Obi's behaviour is questionable

Step 1: Analyze the question The underlined word is questionable, used to describe Obi's behaviour. We need the word closest in meaning in this context.

Step 2: Explain the concept "Questionable" has two main senses:

1. Open to doubt or debate (e.g., a questionable claim).
2. Morally suspect or not clearly honest or proper (e.g., questionable conduct).

When it describes behaviour, it usually means the second sense: behaviour that raises suspicion or seems morally doubtful.

Step 3: Examine the options

• A. disputable: means open to argument. It fits claims or facts, not really the moral quality of behaviour.
• B. worrisome: means causing worry. It is related, but it describes the effect on others, not the suspect nature of the behaviour.
• C. dubious: means doubtful, suspect, not to be trusted. It fits "behaviour" and is the closest match to "questionable" in the sense of morally suspect.
• D. refutable: means able to be proven wrong. It applies to arguments or statements, not behaviour.

Step 4: Answer The best choice is C. dubious. Obi's behaviour is suspect or of doubtful honesty or propriety.

Tip: Always check the word the adjective describes. "Questionable" with claim/statement can mean disputable, but "questionable" with behaviour, conduct, character, or motives usually means dubious or suspicious. Also, "refutable" and "disputable" usually go with arguments, not people's actions.