**Introduction:**
Pure competition is a market structure characterized by a large number of buyers and sellers, homogeneous products, freedom of entry and exit, perfect information, and absence of transport costs. These conditions create a level playing field for all participants and allow for efficient allocation of resources. However, one of these conditions is not an essential requirement for pure competition.

**Explanation:**

**a) Large number of buyers and sellers:**
In pure competition, there is a large number of buyers and sellers. This ensures that no individual buyer or seller has control over the market price. Each participant is a price taker, meaning they have no influence on the price of the product. The presence of numerous buyers and sellers prevents any one entity from exerting market power.

**b) Homogeneous product:**
Another essential condition of pure competition is the existence of a homogeneous product. This means that all products in the market are identical in terms of quality, features, and performance. There is no differentiation among the products, and consumers perceive them as perfect substitutes. This condition allows buyers to make purchasing decisions solely based on price, leading to a perfectly competitive market.

**c) Freedom of entry:**
Freedom of entry and exit is another crucial condition of pure competition. It implies that new firms can enter the market easily, and existing firms can exit if they are unable to compete. This condition ensures that there are no barriers to entry, such as high capital requirements or legal restrictions. It promotes competition by allowing new firms to enter and challenge existing players, preventing the formation of monopolies or oligopolies.

**d) Absence of transport cost:**
The correct answer, option 'D', states that the absence of transport cost is not an essential condition of pure competition. Transport costs refer to the expenses incurred in moving goods or services from the producer to the consumer. While low transport costs may contribute to the efficiency of the market, their absence is not a defining characteristic of pure competition. Other market structures, such as monopolistic competition or oligopoly, can also exist with or without transport costs.

**Conclusion:**
In summary, the absence of transport costs is not an essential condition of pure competition. The other conditions, including a large number of buyers and sellers, a homogeneous product, and freedom of entry, are crucial for the existence of pure competition. These conditions ensure that the market operates efficiently and that no individual buyer or seller can influence the market price.

Pure competition is nothing but perfect competition in such a perfect competition market the following are the Essential elements there are existence of large buyers and sellers homogeneous product end of freedom in entry and exit in the industry and therefore option d is the correct answer