Which of these discount instruments carries the largest YIELD

Question $12$ options:

A T$-$Bill expiring in $6$ months being offered at $97\mathrm{.}25\%$

A Banker's Acceptance from Citibank due in $1$ year being shopped around at $94\%$

Commercial Paper from Ford, expiring in $6$ months, being offered at $95\%$

Commercial Paper from John Deere, expiring in $3$ months, being offered at $98\mathrm{.}75\%$