The correct option is B construction of a river bridge
A joint venture is a business arrangement where in two or more parties come together, pool their resources and agree to share profits earned by accomplishing specific projects /activities/ tasks etc. In most cases, it is formed to use the best qualities of both the parties to accomplish a huge project. For eg, Google and NASA came together to develop Google Earth. So, from the given options, construct of a river bridge is an appropriate project for which joint venture may came into the picture.