In this question, a sentence has been divided into four parts marked as I, II, III, IV. You need to find which part/parts does not/do not have an error in terms of grammatical and contextual usage. If the sentence is contextually correct, mark "All are incorrect." as your answer. 

I - BJP insiders said a gradual generational shifts
II - were taking place in the
III - party with more space being made 
IV - to new and young leaders.