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In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

Article: Homework can put you in a bad mood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Question: Researchers did experiments on kids in order to find out _ .
Options: (A) how they really feel when they are learning (B) whether mood affects their learning ability (C) what methods are easy for kids to learn (D) the relationship between sadness and happiness
Solution: B
Why? It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment. So, B is the correct answer.

New input: Article: Have you ever stood side by side with an elephant and touched its ear or its long nose? A marvelous opportunity is offered here for you to experience working with these giant animals. The daily highlight is the walk from the elephant orphanage down to the river to bathe the elephants. Imaging what an amazing fun it is to watch an entire herd splashing around and rolling in the river just feet in front of you! This opportunity is available through a programme designed for visitors and volunteers to work in the world-famous government-run elephant orphanage in Pinnawela, Sri Lanka. The orphanage is regarded as one of the largest centers of its kind in the world, with one of the most successful captive breeding programmes for Asian elephants. Pinnawela Orphanage is situated in the hills of central Sri Lanka. It was established in 1975 by the Sir Lanka Wildlife Department. The orphanage's 24 acres are a home for the many baby elephants found in the jungle without their mothers. In most of these cases the mothers had either died or been killed. Baby elephants cared for by the orphanage are released into the wild when they reach a certain age. The volunteers' working hours are quite short so there is plenty of time to sightsee and explore. The volunteer work consists mainly of the day-to-day aspects of running the orphanage, rather than more specialized research-based work. The volunteers' main duties are cleaning the elephant homes in the morning (hard, muddy work!) and bathing some of the smaller elephants. Some elephants are overly large or have not been tamed or trained to a satisfactory level. However there are still enough opportunities to have full hands-on contact safely. While the mahouts are bathing the larger elephants, you will have a chance to relax by the river, chat with the mahouts and watch the elephants play and interact with humans and each other. It is an ly beautiful sight. Being around these serene animals in such a beautiful setting can have a very calming effect! If you are interested in such an experience, contact us for more information.
Question: How many main duties does the passage list for the volunteers?
Options: (A) Two. (B) Three. (C) Four. (D) Five.
Solution:
A