experts i need help plzz. for economics project which is a better option among the three: 1) cost and revenue 2) ppc 3) determinants of elasticity of demand which can be easy for answering in viva too ??? plzz help 

Dear student, 
Both the topics are equal in terms of difficulty level. You can attempt either of them. With a through knowledge you can attempt their viva with ease. 

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