C because yoyo's are the oldest toy of the century but the prices goes up and down
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The answer C correctly uses possessive form and is the right answer. It's not A because there is only one George so the apostrophe is in the wrong place. In B, there's not even an apostrophe and it's not clear as to whether there is only one cousin or two or more cousins. In answer D, here should not be an apostrophe for develops.
Answer:
Summary of Deep Survival: In extraordinary circumstances, like accidents or catastrophes, some people survive and others die, such that sometimes things lead you to believe that the first ones die and the second ones survive; this book explains, using numerous stories of accidents and catastrophes, and by exploring the latest scientific theories – from neuroscience to the theory of chaos – what makes one person die and another survive.