Step 1: Concept
The Medical Termination of Pregnancy (MTP) Act, 1971, specifies strict conditions regarding who, when, and where a pregnancy can be terminated.
Step 2: Meaning
For a termination to be legal, it must be performed at a government hospital or a place specifically approved by the government for this purpose.
Step 3: Analysis
Terminating a pregnancy in a private residence (even if it belongs to a doctor) is strictly prohibited and illegal under the Act.
Step 4: Conclusion
Therefore, the situation described in option C is illegal.
Final Answer: (C)