Answer: b.if a seller charges more than the going price, buyers will go elsewhere to make their purchases
Step-by-step explanation:
A competitive market is characterised by :
1. Firms in the market been price takers.
2. No barriers to entry or exit.
3. Perfect homogenous products.
Because goods in a competition market are homogenous, if a firm increases it's price, customers would go and buy the product from the firm that sells at the market price.
Also firms in a competitive market are price takers, so they cannot set the market price.