Which of the Following Describes the Relative Nucleophilicities of Methoxide

Which of the following describes the relative nucleophilicities of methoxide and tert- butoxide?

A) These alkoxides have the same nucleophilicity because the negative charge in both is on an oxygen atom.
B) Methoxide is more nucleophilic because the nucleophilicity of tert-butoxide is decreased by steric effects.
C) tert-Butoxide is more nucleophilic because it contains three methyl groups which increase the charge on its oxygen by donating electron density.
D) tert-Butoxide is more nucleophilic because it is more basic.
E) none of the above