Correct Answer: Assist

Solution : The correct choice is the second option .

The word obstruct means to block, hinder, or impede progress or movement. The antonym, or opposite, of obstruct is assist . It means to help, support, or aid in the progress or achievement of something.

The meanings of the other options are as follows:

• Disrupt : This implies causing disorder or confusion, which might hinder progress but doesn't precisely oppose the meaning of obstruct in this context.
• Spoil : This term suggests ruining or damaging something, which might have an effect similar to obstructing progress.
• Repress : This means to suppress, restrain, or hold back.

In the context of the sentence, assist is the most appropriate antonym for obstruct because it directly contrasts the act of hindering progress by instead supporting or aiding in its success.