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Ans 2:
Class : Class 8
In my opinion, C should be right, because, 'if you need' in this sentence shows that, in case if you need any further information without any hesitations you can ask, I feel 'should you need' doesn't give proper meaning.
Ans 3:
Class : Class 8
In my opinion, both option (C) and option (D) are correct. Both of them imply the same meaning.