‘e-Biz’ refer to

The correct answer is D. e-Biz was one of the Mission Mode Projects under the National e-Governance Plan (NeGP), set up as a Government-to-Business (G2B) initiative. Its purpose was a single window through which businesses could approach government services such as registrations, licences, approvals and filings, without visiting many offices separately.

• A is wrong. Electronic commerce means buying and selling goods or services online between parties. It is a market activity, not a government service portal.
• B is wrong. Single-window financial transactions is not the defining feature of e-Biz. Payments may be part of some services, but the core idea is access to government services.
• C is wrong. It is close but too narrow. Business inquiries are only one small part of what the single window covered.

The concept is e-governance and the G2B model, and it links to the Mains theme of ease of doing business and citizen-centric service delivery. Note that the project's services have since been folded into newer platforms and state single-window systems, so answer the exam-year framing, not today's portal structure.

Trap: choosing A because "e-" suggests electronic commerce. Remember that e-Biz is about government-to-business service delivery, not trade.