Please check it first! Financial Management (Need calculation and explanation)

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A corporation would like to recapitalize its capital structure by issuing a bond. Bonds from this corporation had been rated as BBB+.  Which one of the following bond issues poses the least risk to the issuer corporation? Explain your answer in detail.

Bond    Currency    Issue Volume    Issue Price    Denomination    Coupon    Maturity Date
A              USD    750,000,000.00    99.98    $1,000    3.8750%    28/2/2027
B              USD    500,000,000.00    99.41    $1,000    3.1250%    13/3/2025
C              USD    1,500,000,000.00    99.59    $1,000    5.5500%    13/1/2026

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