The answer is source B because it has a listed author who is an expert and it is the governments organization website which are more reliable that a .com website. Source A does not even list the author so you do not know who wrote it could be anyone.
Center for disease control, national institute of health, occupational safety and health administrations.
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Answer:
C<em>?</em>
Explanation:
The preoperational stage is the second stage in Piaget's theory of cognitive development. This stage begins around age two and lasts until approximately age seven. During this period, children are thinking at a symbolic level but are not yet using cognitive operations.
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