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.

[Q]: The cactus moth was deliberately introduced to Australia in 1926 as a biological control for an invasive prickly pear cactus. By the early 1990s the moth had also migrated to the Florida Keys from South America and the moth soon eliminated most of the semaphore cacti in the region. Since then, the moth has adapted to eat other plants in the Keys and has continued to grow in number. Which procedure would most likely reduce the population of the cactus moth?  
 (A) Release sterile moths to limit reproduction. (B) Use widespread spraying of insecticides. (C) Introduce a predator of the cacti. (D) Stop importation of all types of plants.
[A]: A


[Q]: After a soccer game, Brittany sat under a fan because she was hot. Under the fan, she felt cooler than before. Which explains why Brittany felt cooler under the fan?  
 (A) Air moving under the fan is cooler than air that is still. (B) The evaporation of sweat absorbs heat from the skin. (C) Water vapor from the fan condenses on the skin. (D) The fan speeds convection currents in the air.
[A]: B


[Q]: The main disadvantage of using solar energy to generate electricity is that solar panels  
 (A) produce greenhouse gases. (B) produce water pollution. (C) are expensive to operate. (D) are expensive to purchase.
[A]:
D


