Answer: A. Ivan wanted to be alone so he could dispose of the nose.
Step-by-step explanation: In this lines we can see the description of a man feeling desperate for an apparently inofensive situation (the merchants opening their shops, and the streets starting to be transited by people), this despair is caused by his desire of being alone so he could dispose of the nose he secretly had, and he couldn't do that if there were many people on the streets.