This sentence describes bank chairmen meeting World bank officials, and we need to check if every word agrees correctly with the noun it refers to.
The error lies in part (c), "senior World bank officials to give its", because the singular pronoun "its" does not agree with the plural noun it stands for.
Let's summarize:
So the correct option is (c), "senior World bank officials to give its".
If the price of a commodity increases by 25%, by what percentage should the consumption be reduced to keep the expenditure the same?