The Committee is thinking (1) / not to bring around any change (2) / in the basic structure.(3) / No error. (4)

Answer

2

Explanation

about will replace around because -
bring about (Phr. V.): to cause something to happen bring around (Phr. V.): to take a certain course of action
Look at the examples given below:
The invention of the engine brought about a huge shift in people.s mobility.
The last debate brought around a lot of voters to our candidate.
Hence, not to bring about any change is the right usage