What is the most popular landmark in Paris

Choose the letter A, B, C or D to answer these following questions

Paris is my favorite city. It is the capital city of France. It is very well-known as the City of Light. It is located on the Seine River. It covers an area of 105.4 square kilometers. You can see many fascinating things and sights in Paris. The most popular landmark is Eiffel tower. In Paris, you will find many shopping areas. One of the famous shopping areas is Mont Mart. It has a lot of wine shops, bakeries, clothing shops, restaurants, etc.

Question: What is the most popular landmark in Paris?