Correct Answer: Fake

Solution : The second option is the correct answer.

"Authentic" refers to something that is genuine, real, or true to its origin. On the other hand, "fake" is the opposite, indicating something that is not genuine, counterfeit, or true to its claimed origin.

The meanings of other options are as follows:

• Genuine means real, authentic, not fake or counterfeit.
• Basic means fundamental, simple, essential, not elaborate or advanced.
• Different means not the same, distinct, varying from the norm, or other things.

Therefore, the correct answer is fake.