**Core Concept**
The Medical Termination of Pregnancy (MTP) Act in India regulates the conditions under which a pregnancy can be terminated. The Act aims to balance the woman's right to choose with the need to protect the fetus and ensure safe medical practices.

**Why the Correct Answer is Right**
The MTP Act allows for the termination of pregnancy up to 20 weeks under certain conditions. This is based on the recommendations of the Law Commission of India and the Medical Council of India. The act takes into account the fetal viability and the woman's physical and mental health, ensuring that the termination is carried out in a safe and humane manner. The 20-week limit is also aligned with the gestational age at which the fetus is considered viable, making it a critical period for termination.

**Why Each Wrong Option is Incorrect**
**Option A:** 12 weeks is too early for termination under the MTP Act, as it does not account for the gestational age at which fetal viability is a concern.
**Option B:** 16 weeks is still within the permissible limit, but it is not the maximum gestational age allowed for termination under the Act.
**Option D:** 10 weeks is significantly earlier than the allowed limit and would not be considered for termination under the MTP Act.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the MTP Act requires the opinion of at least one registered medical practitioner to be obtained before terminating a pregnancy, and the termination must be carried out in a hospital or a nursing home with proper facilities.

**✓ Correct Answer: C. 20 weeks**