You are given a science question (hard-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.
One example is below.
Q: Which event can cause a large rock to become soil over time? 
 (A) decaying (B) an earthquake (C) a landslide (D) weathering
A: D
Rationale: Under the action of heat, cold, rain, wind, and other atmospheric factors, the rock breaks down physically into small fragments that become the parent material of the soil. Also, atmospheric factors change according to weather.
Q: A class plans an investigation to see which brand of light bulb lasts the longest. Which of these steps should come first?  
 (A) Repeat the investigation. (B) Write a report of the results. (C) Make a table for recording data. (D) Make daily observations of the light bulbs.
A:
C