Question

this text is mainly about the
a companies that are hired to manage the purchases people make with bitcoin.
b growth of blockchain technology and its use in different businesses.
c reasons most people are not interested in using bitcoin or blockchain technology.
d problems with digital transactions and how people can protect themselves.

Explanation:

To determine the main idea, we analyze each option:

• Option A focuses on companies managing Bitcoin purchases, which is too narrow.
• Option B addresses the growth of blockchain technology and its business uses, which is a broader and more likely main topic as blockchain (including Bitcoin) has expanded into various businesses.
• Option C is about people's lack of interest in Bitcoin/blockchain, which is not a typical main topic of a text about blockchain's development.
• Option D is about digital transaction problems and protection, which is unrelated to the core of blockchain's growth and business use.

Answer:

B. growth of blockchain technology and its use in different businesses.