The requirement is to evaluate the potential cost of an AI solution b efore deployment so the company can support a return on AI investment (ROAI) analysis .

The correct choice is C. Azure pricing calculator .

Why C is correct:

The Azure pricing calculator is used to estimate the expected cost of Azure services before implemen tation. For an AI solution such as sentiment analysis on customer product reviews , it helps estimate likely spending across the relevant Azure components and usage patterns. That makes it the right tool for cost forecasting as part of ROAI planning.

Why the other options are not correct:

A. Total Cost of Ownership (TCO) Calculator TCO is mainly used to compare broader infrastructure costs, often for migration or environment-level cost comparisons, not detailed service pricing estimation for a planned Azure AI solution.

B. Azure Reservations Reservations are a purchasing/discount mechanism, not the primary tool for estimating potential solution cost.

D. Azure Monitor Azure Monitor tracks operational metrics and runtime health after deployment; it is not used for pre-deployment cost estimation.