Step 1: Concept When an action began in the past and continues to the present (indicated by "since"), the Present Perfect Continuous tense must be used.
Step 2: Meaning The sister started her course last year and is still studying it now.
Step 3: Analysis Part 2 uses the Present Continuous ("is studying"), which is incorrect for actions defined by a duration or starting point in the past. It should be "has been studying".
Step 4: Conclusion The error is in Part 2.
Final Answer: (B)
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