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]: Which occurs as a result of Earth's tilt on its rotating axis?  
 (A) movement of the tides (B) prevalent or trade winds (C) seasonal changes in the climate (D) light and dark changes of day and night
[A]: C


[Q]: Lichens are symbiotic organisms made of green algae and fungi. What do the green algae supply to the fungi in this symbiotic relationship?  
 (A) carbon dioxide (B) food (C) protection (D) water
[A]: B


[Q]: The large-scale development of personal automobiles started in the early 1900s. Which of the following was a major cost associated with the efficient use of these automobiles?  
 (A) Road systems had to be expanded. (B) Cities had to be built farther apart. (C) Houses inside cities had to be built farther apart. (D) Vehicle choices available to consumers had to be expanded.
[A]:
A