Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

In contrast to high-yield credit analysis, investment-grade analysis is more likely to rely on:
Option A:spread risk.
Option B:an assessment of bank credit facilities.
Option C:matching of liquidity sources to upcoming debt maturities.

Answer: A