Based on this quote, "His [Snowball] imagination had now run far beyond chaff-cutters and turnip-slicers. Electricity, he said, could operate threshing machines, ploughs, harrows, rollers, and reapers and binders, besides supplying every stall with its own electric light, hot and cold water, and an electric heater." Snowball can be described as a an idealist, for he is hopeful about the windmill.
b. manipulative because he is using the pigeons the same way as Napoleon uses the dogs.
c. faithful because he is standing by Napoleon's windmill idea.
d. uncertain, for he is uneasy about the rebellion and what is happening on the farm.