The Eighth Five-Year Plan of India had an objective to achieve an annual growth rate of 5.6%. This growth rate target was intended to improve the country`s economy.

Option 2, 6%, is not accurate as that rate was too high for this particular Plan`s goal.

Option 3, 6.5%, is also incorrect. The Indian government didn`t aim to elevate the growth rate to this level in the Eighth Plan.

Option 4, 7%, is incorrect for the same reason. The correct growth rate was significantly lower than 7%.

Therefore, option 1 with 5.6% is the correct answer as it`s the exact annual growth rate targeted in the Eighth Five-Year Plan.