Candidate A has the best education for the position of Budget Analyst, as a bachelor's degree in Finance is particularly relevant to budgeting and financial analysis, and the master's degree in Mathematics provides a strong quantitative background that is beneficial for analyzing financial data.
Candidate D, with a bachelor's degree in Economics and a master's in Management, also has relevant qualifications, but Candidate A's combination of Finance and Mathematics is more directly suited to the specific skills required for a Budget Analyst role.