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.

Q: Patricia and her classmates are visiting different rocky areas in the city. They want to know what kind of rocks can be found in each area. If the investigation is done correctly, what will Patricia and her classmates do each time they visit an area?  
 (A) draw the rock shapes (B) count the rock numbers (C) record the rock types and locations (D) measure the rock masses and lengths

A: C
****
Q: After a star runs out of most of its hydrogen fuel, it becomes hotter and more luminous. What stage does this represent in the life cycle of a star?  
 (A) quasar (B) protostar (C) red giant (D) white dwarf

A: C
****
Q: The conservation of matter can be demonstrated by using chemical equations. Which chemical equation demonstrates the conservation of matter?  
 (A) 2Sn + 4HNO_{3} -> SnO_{2} + 4NO_{2} + H_{2}O (B) I_{2} + 5Cl_{2} + 6H_{2}O -> 2HIO_{3} + 10HCl (C) Cl + 4Na -> 4NaCl (D) 4P + 5HNO_{3} -> 5NO + 3H_{3}PO_{4}

A:
B
****