This is sole sourcing as there is only one supplier in the marketplace.
Be careful not to confuse single sourcing and sole sourcing. Single sourcing is when a buyer chooses to work with only one supplier (usually to achieve economies of scale), sole sourcing, on the other hand, is when the buyer doesn't have a choice- they work with one supplier because there is only one supplier in the market.
Types of sourcing is a key concept for this exam.

The balance sheet and profit and loss account provide a comprehensive view of an organisation's financial health, showing assets, liabilities, and profits. These statements are essential in evaluating a supplier's financial capacity, aligning with responsible sourcing practices for financial stability.

The acid test (quick ratio) is an effective measure of a supplier's ability to meet short-term liabilities, providing insights into financial stability. This aligns with responsible sourcing by ensuring the supplier is financially capable of fulfilling a strategic contract.

An open tender is advertised publicly and open to all interested suppliers. For it to be effective, there must be a sufficient supplier market (A) to justify competition. If supplier numbers are too low, restricted or negotiated procedures may be more appropriate. Pre-qualification applies to restricted tenders, not open ones.
Price-only evaluation breaches responsible sourcing principles, which require balanced criteria. Responsible sourcing highlights that open tendering ensures transparency and fairness but must be used appropriately depending on market conditions.
Reference: CIPS L4M4 Study Guide (v2), LO: "Implementation" - tendering methods and considerations.

EBITDA stands for 'earnings before interest, tax, depreciation and amortization'. This is a profitability ratio and would show how profitable a business is.
EBITDA: Definition, Calculation Formulas, History, and Criticisms (investopedia.com)