Please answer the following question: Read the following article and select the best answer. Article: We see 3D movies, games, TVs, and so on. Do you hear of 3D newspapers? Yes, here is a kind of newspaper from Belgian. And it was born on March 3rd, 2010. This is the first 3D newspaper in the world. Huber Leklein with his friends began to make the 3D newspaper in January,2010. They worked really hard. And they finished in March. If you buy this newspaper ,you can get a pair of free 3D glasses. All the pictures and ads in the newspaper are in 3D,but the articles are not in 3D.You can read this 3D newspaper by holding( ) the newspaper 50cm away from the eyes. In fact, if people don't wear the 3D glasses, they can't read the newspaper very well because the pictures and words in it are not clear. People like reading 3D newspaper very much. But Hubert Lekein and his friends don't want to continue with it because they spent too much money and time. Question: Hubert and his friends spent _ making the newspaper. - two days - two weeks - two months - two years
A:
two months