Answer:
The correct answer would be B, Industry Blocks.
Step-by-step explanation:
When there are companies in a market who offer similar products or services to the consumers, they are said to be operating in the same industry. For example, if there are some companies which provide the telecom facility to the people, they can be grouped together as one industry, The Telecom Industry. So when the performance of the stocks within the same industry is required to compare, then such companies are grouped together which are called the industry blocks. So option B is the appropriate answer.