You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. 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.
--------
Question: India is in the Northern Hemisphere and Australia is in the Southern Hemisphere. In June, it is summer in India and winter in Australia. What is the main reason the seasons are opposite in the two countries?  
 (A) because Earth is tilted on its axis (B) because the Sun rotates on its axis (C) because Earth revolves around the Sun (D) because of the distance between the countries

Answer: A


Question: Two atoms of oxygen combine to form pure oxygen gas. What is the electrical charge of the O_{2} molecules?  
 (A) positive (B) negative (C) neutral (D) variable

Answer: C


Question: A 10 g sample of aluminum and a 10 g sample of iron were each heated by 100 joules of energy. The temperature of the aluminum sample rose 11°C, while the temperature of the iron sample increased 23°C. Which statement best accounts for these results?  
 (A) Iron is twice as dense as aluminum. (B) Atoms of aluminum are smaller than atoms of iron. (C) Using equal masses results in similar heat capacities. (D) The specific heat of iron is less than that of aluminum.

Answer:
D