What makes us happy is....
The best answer in this scenario would be A.Revise her hypothesis and the retest it.Hope this helps, and have a marvelous day.
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.
My answer would be thwack, as in the suction y noise when you step out of the mud.
