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]: A delta can be seen from the air at the mouth of the Mississippi River. This delta was formed by  
 (A) erosion. (B) weathering. (C) conservation of soil. (D) deposition of sediment.
[A]: D


[Q]: Which two things interact most in the water cycle?  
 (A) oceans and the Moon (B) oceans and the Sun (C) lakes and the Moon (D) lakes and the Sun
[A]: B


[Q]: Bacillus thuringiensis (Bt) is a soil bacterium that is toxic to certain insects. Genes from this bacterium have been inserted into cotton to make Bt cotton. Farmers that use Bt cotton would most likely use less of which of the following?  
 (A) water (B) fertilizer (C) herbicide (D) insecticide
[A]:
D