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.

Mrs. Tucker gives her class samples of different soil types. Which action best helps Tanisha identify each soil type?  
 (A) smelling it (B) touching it (C) weighing it (D) measuring it
B

After observing several dogs running, students ask the following question: Do dogs with long hair run faster than dogs with short hair? How can the students best answer their question?  
 (A) record the weights and heights of many dogs (B) measure the speeds and hair lengths of many dogs (C) research to find the type of dog with the longest hair (D) race one long-haired dog against one short-haired dog
B

A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is best supported by this observation?  
 (A) A chemical change took place. (B) The lithium was dissolved by the water. (C) Dissolved gases were released. (D) Water was vaporized.

A