Please answer the following question: Read the following article and select the best answer. Article: Years ago, I lived in a building in a town. There was another building across form mine, and it was only a few meters away. There lived a woman whom I had never met. I could see her sit by the window each afternoon, drinking or reading. Several months later, I noticed her window was very dirty. Everything was not clear through the window. I wondered why the woman didn't wash her window. One sunny morning, I decided to clean up my apartment, including washing my windows. Late in the afternoon when I finished the cleaning, I sat down for a rest by the window. What a surprise! The woman sitting by her window was clearly seen! Her window was clean! Suddenly, I realized I had made a mistake. I was watching her through my dirty window all the time! That was quite an important lesson for me. Since then, whenever I wanted to judge someone, I asked myself first, " Am I looking at him through the dirty window of my heart?" Then I try to clean the window of my own world so that I may see the world clearly. Question: One sunny morning, the writer decided to do some_. - reading - cleaning - shopping - cooking
Answer:
cleaning