Please answer the following question: Read the following article and select the best answer. Article: "The zoo has money problem," Grandmother Sandy said. Angel listened. She heard that Fresno's Chaffee Zoo didn't have enough money to take care of its animals. Angel loved animals. She planned to study them when she grew up. Angel's family had four cats. Angel took good care of them and made sure that they always had food and water. Angel felt sorry for the zoo animals. While the others in the family were cooking dinner, Angel was cooking up a way to help the animals. She decided to write a letter to show how she felt. At the end of the letter, she wrote: "Give a dollar, help an animal." She sent the letter and a dollar to The Fresno Bee, a local newspaper. A few days after that, Angel's letter was published. Almost immediately, people began sending in money. Angel's letter was having effect! At school, Angel went to each classroom to read the letter that appeared on the newspaper. She asked students in her school to give money to the zoo. Next, Angel was asked to appear on television. She was invited to be on a popular talk show. The workers in the zoo were very happy. Ray Navarro is the person most responsible for the animals. "Angel opened the eyes of Fresno," said Ray. "She made us see that people can make a difference." Question: By saying "Angel was cooking up a way to help the animals", the writer means _ - Angel wanted to cook the animals for food - Angel was cooking a meal for the animals - Angel wanted to help the animals to run away - Angel was thinking of an idea to help the animals
A:
Angel was thinking of an idea to help the animals