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<p><strong>A. Occupies less space per unit power.</strong><strong>B. Compounding is not necessary for speed reduction as the rotor speeds are usually low.</strong><strong>C. Suitable for high power generation.</strong></p>
A ... since the question is are there advantages of an impulse turbine over a reaction turbine ... C would be only valid if the advantage is for the reaction turbine.
In terms of energy input versus energy output, a reaction turbine is far more efficient than the old-style impulse turbine, which just had the force of the liquid from the nozzle hitting paddle blades.Read more : http://www.ehow.com/info__advantages-reaction-turbine-design.html
Option A
I can only find proof for A
Answer "C"