Options:
A.
B.
C.
D.
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Earlier discussion
3 older comments kept for context.
Okwunwa Benard Olise
No its not 2:1 but 1:2
H= mc∅
Since m is constant
And ∅x = 2∅y
So cx.2∅y = cy.∅y
Therefore cx/cy = ∅y/2∅y
So x:y = 1:2
Unuakhe Osarobo
Mass is constant but heat heat changes in X is twice that in x then Cx × 2y = Cy × y
The ratio Cx to Cy is
Cx/Cy = y/2y
So we have 1/2 = Cx/Cy
Glory
I suggest the answer is incorrect. From my calculations using the correct formulae.
The correct answer should be 2:1