A concept or principle that relates to transactions is:Multiple Choiceconsistency.materiality.full disclosure.original cost.

Analysis of the Options

1. Consistency: This principle states that once an organization chooses a specific method of accounting, it should continue to use that method throughout unless a change is warranted. This enhances comparability of financial statements but is not primarily a transaction-focused principle.

2. Materiality: This principle allows accountants to disregard certain accounting treatments if the amount is not significant enough to influence the decision-making of users. Materiality is more related to the importance of information rather than the transaction process itself.

3. Full Disclosure: This principle requires that all information that affects the full understanding of a company's financial statements should be reported. While important, it focuses on transparency rather than the execution of transactions.

4. Original Cost: Also known as the historical cost principle, this concept states that assets should be recorded and reported at their original purchase price. This principle directly relates to how transactions are recorded in the accounts.

Final Answer

Based on the analysis of the options provided, the principle that most directly relates to transactions is original cost. This is because it dictates how transactions involving the acquisition of assets should be recorded in the financial statements.