Question

this text is mainly about the
a questions people have about whether online banking is
safe.
b danger blockchain mining creates in computer networks.
c property people own and the documents that prove they
own it.
d basics of blockchain technology and how it is used today.

Explanation:

To determine the correct answer, we analyze each option:

• Option A: Focuses on online banking safety questions, which is not related to the main topic of blockchain technology.
• Option B: Talks about the danger of blockchain mining in computer networks, but the question is about the main topic of the text, and this option is too narrow and negative - focused compared to a general introduction of blockchain.
• Option C: Discusses property and ownership documents, which has no relation to blockchain technology.
• Option D: Mentions the basics of blockchain technology and its current usage, which is a broad and appropriate description of what a text about blockchain would likely cover.

Answer:

D. basics of blockchain technology and how it is used today.