Explanation

In venture capital financing, seed-stage financing is the earliest stage of funding. It typically supports:

1. Transformation of an idea into a business plan - This is the primary purpose of seed-stage financing
2. Initial market research
3. Development of prototypes
4. Formation of the founding team

Let's analyze why the other options are incorrect:

Option A: initial commercial production and sales - This describes later-stage financing, typically Series A or later rounds where the company has a proven product and is ready for scaling.

Option B: product development and/or marketing efforts - While seed funding may support some early product development, this is more characteristic of Series A funding. Marketing efforts typically come even later when the product is ready for market.

Option C: transformation of an idea into a business plan - This is the correct answer. Seed-stage financing helps entrepreneurs turn their initial concept into a formal business plan, conduct feasibility studies, and build a minimum viable product (MVP).

Venture Capital Financing Stages:

1. Seed Stage: Idea → Business plan, market research, prototype
2. Series A: Product development, initial market testing
3. Series B: Scaling operations, marketing, expansion
4. Series C+: Major expansion, acquisitions, preparing for IPO

Therefore, seed-stage financing most directly supports the transformation of an idea into a business plan.