What is the amplitude of the given function What is the ampl

What is the amplitude of the given function?

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The amplitude of a function i.e. sin or cosine function in normal is given

y = a*sin(x) or a*cos(x)

then the amplitude of the function will be |a|, since -1 <= sinx,cosx <=1

Hence for the function

f(theta) = -1/2 * sin(theta)

amplitude = |-1/2| = 1/2 = 0.5

hence option A is correct since amplitude is always a positive quantity