I know you would have to prolong your tour; but still I advise you to complete this job also.

The correct answer is: C. hinder

To hinder something means to make it difficult or slow. In this case, the speaker is saying that the job will be difficult and time-consuming, but they still advise the listener to complete it.

The other options are incorrect because they do not mean to make something difficult or slow.

• Obstruct means
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