Explanation:

While India's total population is still increasing, the *rate* of population growth has been consistently declining over the past few decades. For instance, the decadal growth rate for 2001-2011 was $17.7\%$, which is lower than the $21.5\%$ recorded for 1991-2001. This indicates a declining trend in the growth rate, primarily due to factors like increased literacy, access to family planning, and changing social norms. Option A is incorrect as the rate is falling. Option B is incorrect as it's not constant. Option D is incorrect as the population is still growing, albeit at a slower rate.