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f(x) = x^2
f(a + b) = (a+b)^2 which is not equal to a^2 + b^2 i.e. f(a) + f(b)
f(x) = x + 1
f(a + b) = a+b+1 which is not equal to a+1 + b+1 i.e. f(a) + f(b)
f(x) = sqrt x
f(a + b) = sqrt(a+b) which is not equal to sqrt(a) + sqrt(b) i.e. f(a) + f(b)
f(x) = 2/x
f(a + b) = 2/(a+b) which is not equal to 2/a + 2/b i.e. f(a) + f(b)
f(x) = -3 x
f(a + b) = -3(a+b) = -3a -3b = f(a) + f(b)
ans E
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