Sneaky:
the population of India in 1992 was under 100 crores.
current population of India is

x
the population of India will drop in 2025
the current population of India is today's population.
If we say current populaiton will drop then how today's population can drop in future. Future has new number of population, so we can say population then will be xx
A. current lemur population of Madagascar of roughly 2,000 will drop below 1,000 within five years if present trends are not reversed through either government action or
Simple and concise but made big flaw in making the sentence short and concise by using current population will drop-sneaky-wrong
B. current lemur population of Madagascar is roughly 2,000 and will drop below 1,000 within five years if present trends were not reversed either through government action or through
present trends were: wrong
C. lemur population of Madagascar is currently roughly 2,000, which will drop below 1,000 within five years if present trends would not be reversed either through government action or
Either through or -wrong
D. lemur population of Madagascar is currently roughly 2,000 and will drop below 1,000 within five years if present trends are not reversed either through government action or through
Wordy: Is roughly and will but no other better option logically and grammatically -correct
E. current rough lemur population of Madagascar is 2,000; this would drop below 1,000 within five years if present trends were not reversed either through government action or
Either through or -wrong