Correct Answer: genuine

Solution : The correct answer is the fourth option.

The word "spurious" implies that the drinks were not genuine, authentic, or real; they were likely fake, counterfeit, or of inferior quality. "Genuine" refers to something real, authentic, and not fake.

The meanings of the other options are as follows:

• Curious means eager to learn or know, showing interest.
• Artificial means something made by human skill or not occurring naturally.
• Nefarious means wicked, villainous, or criminal.

Therefore, the correct answer is genuine.