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: A puppy has traits from its mother and its father. Which of these structures provides genetic information from the father to the puppy?  
 (A) a muscle cell (B) a nerve cell (C) a blood cell (D) a sperm cell

Answer: D


Question: Use of nuclear fuel would most likely reduce human contributions to which environmental problem?  
 (A) ozone thinning (B) landfill creation (C) shoreline erosion (D) greenhouse heating

Answer: D


Question: Rocks are classified as sedimentary, metamorphic, or igneous on the basis of the  
 (A) age of the rocks (B) way the rocks were formed (C) types of fossils the rocks contain (D) number of minerals found in the rocks

Answer:
B