document.write( "Question 394207: A certain function f has the property that f(x + y) = f(x) + f(y) for all values of x and y . which of the following statements must be true when a = b ?\r \n" );
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document.write( "I f(a + b) = 2 f(a)\r \n" );
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document.write( "II f(a + b) = [f(a)]^2\r \n" );
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document.write( "III f(b)+ f(b) = f(2a)\r \n" );
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document.write( "(A) none \n" );
document.write( "(B) I only \n" );
document.write( "(C) I and III only \n" );
document.write( "(D) II and III only \n" );
document.write( "(E) I II, and III \r \n" );
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