How many test cases are necessary to cover all possible combinations in equivalence class testing?

A web application for calculation of mortgage loan has 3 input fields:
1. Civil status: Married / Not married
2. Equity: 0 – 100,000 EUR, 100,001 – 500,000 EUR, more than 500,000 EUR
3. Requested amount of the loan: 0 – 100,000 EUR, 100,001 – 500,000 EUR, 500,001 – 800,000 EUR
In addition, 2 different loan types can be chosen.
The application has to be tested for 2 web browsers.
How many test cases are necessary to cover all possible combinations in equivalence class testing?
A. 32
B. 36
C. 72
D. 64

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