The correct answer is option 3, Rourkela. The Iron & Steel Industry in Rourkela was developed with German technical collaboration. This means that the technology and expertise required for the establishment of the industry was provided by German engineers and technicians. It is important to note that the question specifically asks about the place where the industry was developed with German technical collaboration, and Rourkela fits this criteria. Option 1, Durgapur, option 2, Bhilai, and option 4, Bhadravati, do not mention any foreign technical collaboration. It is always important to read the question carefully and consider each option before choosing the correct answer.