**Core Concept**
In many countries, juvenile justice systems are designed to rehabilitate young offenders, particularly those who are considered difficult to manage in a traditional school setting. The concept of sending such individuals to a specialized institution for training and reformation is a common approach to addressing behavioral issues in adolescents.

**Why the Correct Answer is Right**
The correct answer is likely related to a specific type of institution that focuses on the rehabilitation of young offenders. In many countries, including India, boys over 16 years who are considered difficult to handle in a certified school are sent to a "Remand Home" or a "Juvenile Correctional Facility" for training and reformation for 3 years. These institutions provide a structured environment that includes education, vocational training, and counseling to help young offenders develop essential life skills and become productive members of society.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a type of institution that focuses on the rehabilitation of young offenders.
* **Option B:** This option is incorrect because it is not a recognized type of institution for the rehabilitation of young offenders.
* **Option C:** This option is incorrect because it does not specify a type of institution that provides the necessary training and reformation for young offenders.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the specific type of institution may vary depending on the country's laws and regulations regarding juvenile justice. However, the primary goal of such institutions is always to rehabilitate and reintegrate young offenders into society.

**Correct Answer: D. Borstal Institution**