Reena took a loan of Rs. 1200 with simple interest for as many years as the rate of interest.

Explanation:

As per the question:

Principal amount (P) is Rs.1,200

Simple interest (SI) is Rs. 432

The rate of interest and the time are equal and both are referred to as “R”.

The rate of interest can be found by substituting the available variables in the simple interest (SI) formula:

Final Answer:

Hence, the correct answer is option B: 6.