Correct Answer: Scarce

Solution : The correct choice is the second option .

Abundant is something that is available more than enough, or plentily.

Scarce is something that is insufficient to meet the demand. Both of these words imply the opposite meaning with regard to something available and, thus, are antonyms.

The meanings of the other options are as follows:

• A surplus is the amount that has been left after meeting the demand.
• Brilliant is someone who is exceptionally clever.
• Rich means present in abundant quantity.