Truman referred to the republican majority congress as the because of their enact his legislative agenda.
a.
“do everything congress”; rejections to
c.
“do nothing congress”; refusal to
b.
“do everything congress”; ability to
d.
“do nothing congress”; success in

I am pretty sure that the statement represented above should look like that:  
Truman referred to the Republican majority Congress as the "Do Nothing Congress" because of their success in enact his legislative agenda. 
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The significance of the result is the change

The answer is option b and c.