The correct answer is Ratan Tata take across the reins of the company​. Key Points ​Let's understand the difference between the phrasal verbs given below: take across- to carry, guide, or convey someone or something from one side (of a thing or place) to another take over- assume control of something Examples: He was arrested for taking drugs across the border. The firm was badly in need of restructuring when she took over.​ As per the context of the sentence, Ratan Tata took control of the company and took an active part in it. Thus the preposition 'over' will be the correct choice in the part given in the 4th option. ​Correct Sentence: Often hailed as one of the greatest industry leaders of India, Ratan Tata took over the reins of the company, leading from the front.