The correct choice is (c) Aspartate
To elaborate: Basic amino-acids are those which have basic sidechains at neutral pH, whereas acidic amino-acids are those which have acidic side chains at neutral pH. Arginine, histidine and lysine are basic amino-acids as they contain nitrogen as sidechain and resemble ammonia which is base. Aspartate and Glutamate are acidic amino-acids as they have carboxylic acids groups as their side chain.