Correct option is B
able to drink contains an error.
Detailed Explanation:
The error is in the phrase
"able to drink". The correct phrase should be
"allowed to drink" because the sentence refers to legal permission, not physical ability.
·
"Able to" implies physical or mental capability.
·
"Allowed to" implies having permission.
Corrected sentence:
In some countries, you are not
allowed to drink until you are 21.