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.

Input: Consider Input: When a tree suffers from a decreased ability to transport materials within the phloem, what is directly impacted?  
 (A) volume of water in the xylem (B) flow of necessary nutrients (C) response to environmental factors (D) rate of photosynthesis in leaves

Output: B


Input: Consider Input: Which property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature

Output: B


Input: Consider Input: Some plants rely on hummingbirds for pollination. If a deadly disease infected the hummingbird population, what would most likely happen to the plants?  
 (A) They would die within hours. (B) They would become endangered. (C) They would need to migrate. (D) They would grow at a slower rate.


Output: B