hi please answer a, b, and c also first question on bottom

Which do you prefer: a bank account that pays 5.6% per year (EAR) for three years or a. An account that pays 2.1% every six months for three years? b. An account that pays 7.4% every 18 months for three years? c. An account that pays 0.42% per month for three years? (Note: Compare your current bank EAR with each of the three alternative accounts. Be careful not to round any intermediate steps less than six decimal places.) If you deposit $1 into a bank account that pays 5.6% per year for three years: The amount you will receive after three years Ss (Round to five decimal places.)