Answer: Option E
Explanation: In simple words, it refers to the situation in which two rival companies in an industry cut their prices with the objective of cutting the others customers and gaining a higher market share.
Generally it is performed for short term so that other firm could be demolished from the market but a company having strong reserves can perform it for a long term as well.
It is more evident in industries where the products of two companies are close substitutes of each other and there are few firs in the industry.