Read the following article and select the best answer. Article: Mrs Brown has a big garden and she likes growing vegetables very much. There are many kinds of vegetables in Mrs Brown's garden. She looks after them and the vegetables look very nice. The vegetables grow well and Mrs Brown wants to make dinner with them one day. Today, it is sunny. Mrs Brown's son, four-year-old Johnson, is playing in the garden. Mrs Brown is cleaning the house. Suddenly ,Johnson runs in and says, "Mom, Mom! Come to the garden! Our neighbor's ducks are in the garden and they are eating our vegetables." But it is too late. The ducks eat up all the vegetables. Mrs Brown is very sad and her neighbor is very sorry. After a few days, the neighbor brings a box to Mrs Brown. There is a roast duck in the box. And there is also a piece of paper in it. Some words are on _ : I am sorry. Enjoy your vegetables. Question: Mrs Brown is very sad because. - her neighbor is playing in her garden - her son doesn't finish his homework. - her neighbor's ducks eat up her vegetables - she doesn't have any vegetables to make lunch.
Answer:
her neighbor's ducks eat up her vegetables