Recent research has shown that when calculators are allowed into classrooms at the elementary level, the arithmetic ability of pupils becomes weaker. The calculator is a convenient tool that increases accuracy and is widely used. The use of calculators in school should be limited to high school students. Developmental psychologists have proven that even though a child may seem to grasp a concept fully, that child needs time and practice to integrate it properly if it is to be used as an actual application.

Which of the following, if true, supports the argument's conclusion?

A) Subject matter in the high school syllabus is aimed at developing reasoning and problem-solving logic, and begins to move away from the rudimentary performing of tasks.

B) The systematic approach that working with a calculator demands can assist elementary pupils further in understanding arithmetic method.

C) The functionality of calculators is constantly being improved to include features that apply to a variety of study fields.

D) Almost 75% of the calculators used by elementary school pupils are bought by parents, not by request of their children.

E) In the professional world, many careless errors are committed that could have been prevented if calculators were used.

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