The correct answer is C. Car repair industry.
A monopolistically competitive industry is one in which there are many firms selling similar but not identical products. Firms in a monopolistically competitive industry have some market power, but not as much as a monopoly. This means that they can charge a price above marginal cost, but they cannot charge a price that is too high, or consumers will switch to other firms.
The car repair industry is a good example of a monopolistically competitive industry. There are many car repair shops in any given area, and they all offer similar services. However, each shop has its own unique features, such as its location, its hours of operation, and the quality of its work. This means that consumers have some choice about which shop to use, and shops must compete for customers.
The automobile industry, the steel industry, and the electrical generating industry are all examples of oligopolistic industries. In an oligopolistic industry, there are a few large firms that dominate the market. These firms have a lot of market power, and they can therefore charge a price above marginal cost.
In conclusion, the car repair industry is the most likely of the four industries listed to be monopolistically competitive. This is because there are many firms selling similar but not identical products, and firms have some market power but not as much as a monopoly.