Reasoning:

Hybrid bond origination is most attractive where an issuer has a clear need for equity-credit capital, large capex/funding requirements, rising leverage, and a profile where hybrids are strategically relevant or already accepted.

1. **TenneT Holding B.V. — strongest first call**
   - TenneT has the clearest structural need for capital: assets rose sharply to **€38.5bn** from **€31.2bn**, driven by heavy grid investment.
   - Capex/investing cash outflow was very large: **€4.35bn** in 2022.
   - Debt increased materially, with long-term borrowings rising to **€19.0bn** from **€12.4bn**.
   - Free cash flow is deeply negative after capex, and financing needs are substantial.
   - Crucially, TenneT already has **€2.125bn of hybrid capital** on its balance sheet, making it an established hybrid issuer with a demonstrated rationale for this instrument.
   - Although the company is loss-making in 2022, it is a regulated transmission system operator owned by the Dutch State, which supports market access and strategic infrastructure appeal.

2. **EDP, S.A. — second-best prospect**
   - EDP is a large, active utility with substantial renewable/grid capex and sizeable balance sheet needs.
   - It has meaningful leverage: total liabilities of **€45.0bn** against equity of **€13.8bn**, and borrowings increased materially, especially current borrowings.
   - It generated positive operating cash flow of **€3.78bn**, but investing cash flow was negative **€3.23bn**, reflecting ongoing investment needs.
   - Profitability is positive and stable, with **€1.17bn** net profit and **€679m** attributable to owners.
   - EDP does not show existing hybrid capital in the provided data, but its scale, investment program, and utility profile make it a credible hybrid candidate.

3. **A2A Energia S.p.A. / A2A S.p.A. — third**
   - A2A is also a plausible utility-sector issuer, with rising assets and increased financial liabilities.
   - However, compared with TenneT and EDP, its funding pressure appears less compelling: operating cash flow of **€1.26bn** largely covers investing outflow of **€1.14bn**, resulting in positive free cash flow.
   - Profitability remains positive, but owner-attributable profit declined from **€504m** to **€401m**.
   - There is no indicated existing hybrid capital, and the strategic urgency for hybrid equity credit appears lower than for TenneT or EDP.

<answer>C,A,B</answer>