单选题Given the following script， why does the output come out as an empty line instead of "dog"？（）A The $VAR variable was not exportedB The $VAR should have been set as VARC dog needs double quotes around it when setting $VARD The { } should not be around VAR in the echo command
单选题
Given the following script， why does the output come out as an empty line instead of "dog"？（）
A
The $VAR variable was not exported
B
The $VAR should have been set as VAR
C
dog needs double quotes around it when setting $VAR
D
The { } should not be around VAR in the echo command
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