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Which sentence is punctuated correctly?

A.

There is a simple explanation for my sister’s attitude: She is too young to understand.
B.

There is a simple explanation for my, sister’s attitude she is too young to understand.
C.

There is a simple explanation for my sister’s; attitude She is too young to understand.
D.

There is a simple explanation for my: sister’s attitude she is too young to understand.

Question

.	

Which sentence is punctuated correctly?

    A.	

    There is a simple explanation for my sister’s attitude: She is too young to understand.
    B.	

    There is a simple explanation for my, sister’s attitude she is too young to understand.
    C.	

    There is a simple explanation for my sister’s; attitude She is too young to understand.
    D.	

    There is a simple explanation for my: sister’s attitude she is too young to understand.

anonymous · Answer

it is a because they are both complete sentences unlike the other one.