Which of these bonds should give you the highest yield?

Question $14$ options:

General Mills Bond maturing $3/31/2029,3\%$ coupon, being offered at $90$

Treasury Bond maturing $3/31/2029,3\mathrm{.}95\%$ coupon, being offered at $100$

Kellogg's Bond maturing $3/31/2029,7\%$ coupon, being offered at $110$

Nabisco Bond maturing $3/31/2029,4\%$ coupon, being offered at $85$