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.

[Q]: Which land feature is formed from erosion by waves?   
 (A) a sandbar (B) a sea cliff (C) a barrier reef (D) a barrier island
[A]: B


[Q]: When air rises over the open ocean, a low pressure system is formed. Which factor increases the potential of a low pressure system developing into a hurricane in the Northern Hemisphere?  
 (A) cool ocean currents circulating towards the equator (B) increased volcanic activity in the upper latitudes (C) cold air moving south from the North Pole (D) warm water temperatures in the tropics
[A]: D


[Q]: What two factors determine the location of an electron around the nucleus of the atom?  
 (A) speed and direction of the electron (B) size of the electron and the neutron (C) direction and strength of the electron (D) energy and the attraction of the nucleus
[A]:
D