Select the most appropriate option to fill in blank number (3).
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. remains.
Let's have a look at the meaning of the given options:-
- refunds- a sum of money that is paid back to you, especially because you have paid too much or you are not happy with something you have bought.
- remains- what is left behind after other parts have been used or taken away.
- revenues- money regularly received by a government, company, etc.
- returns- to come or go back to a place.
"Remains of aquatic structures" will make a suitable phrase here.
Hence, the chosen option will be correct.