It can be assumed reasonably that language has
only one code
two codes
three codes
three codes,two used for education
more than three codes but only two used for education
Explanation
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The correct answer is: B. two codes 
Explanation:
According to Basil Bernstein’s code theory, language can be classified into two main codes:
Restricted code
Common among working-class children.
Context-dependent, informal, limited vocabulary, shared meanings.
Elaborated code
Common among middle-class children.
Explicit, abstract, suitable for school and formal situations.
These two codes explain why some children struggle in school:
Schools typically use the elaborated code, which may be unfamiliar to children from homes where only the restricted code is used.
Why other options are wrong:
A. only one code 
– Bernstein clearly identifies two codes.
C. three codes – No evidence of a third code in his theory.
D. three codes, two used for education – Only the elaborated code is used for school, restricted code is informal; no third code is mentioned.
E. more than three codes but only two used for education – Theory only talks about two codes, not more.
