A) \[3{{x}^{3}}+7{{x}^{4}}+2{{x}^{2}}\]
B) \[2{{x}^{4}}+4x{{y}^{3}}-2{{y}^{4}}\]
C) \[3{{x}^{4}}+7{{x}^{2}}{{y}^{2}}+2{{y}^{4}}\]
D) \[4{{x}^{4}}+7xy+3{{y}^{2}}\]
E) None of these
Correct Answer: C
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