Please explain this question :

Dear Student,

y = S i n ω t + C o s ω t \frac{d y}{d t} = ω C o s ω t - ω S i n ω t a = \frac{d^{2} y}{d t^{2}} = - ω^{2} S i n ω t - ω^{2} C o s ω t = - ω^{2} (S i n ω t + C o s ω t) = - ω^{2} y a \propto - y w h i c h i s t h e c o n d i t i o n o f s i m p l e h a r m o n i c m o t i o n . o p t i o n (C) i s c o r r e c t .

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