Detailed Instructions: 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: What is the frequency of ocean waves that have a speed of 18 m/s and a wavelength of 50 m?
(A) 0.18 Hz (B) 0.36 Hz (C) 2.8 Hz (D) 9.0 Hz
A:
B