Here it is
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To make more product we need to shift equilibrium to the right -Le Chateliers principal.This can done either by removing water or by removing any of the product .
Sodium metaborate, Na[B(OH) ₄ ] makes chelating complex with ethylene glycol and this helps in removal of sodium metaborate, Na[B(OH) 4  ] from the solution.

What is the answer option b or c ?
How do we come to know about it?

Quote from: Pranjal Singh on March 02, 2021, 06:51:17 AM
What is the answer option b or c ?
How do we come to know about it?

Answer is cis- ethylene glycol
Trans can not form such stable complex.