Answer:
Paid.
Explanation:
Paid makes the most sense. Both would work, but paid fits with the most reasoning.
Answer:
A. able to be maintained
sus·tain·a·ble
/səˈstānəb(ə)l/
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adjective
adjective: sustainable
1. able to be maintained at a certain rate or level.
conserving an ecological balance by avoiding depletion of natural resources.
2. able to be upheld or defended.
Explanation:
Hope this helps.