1 - certainly not c or d; could well be a or b (neither of which is specified in the article).
2 - d
3 and 4 - insufficient data; we know nothing ([U]from this text[/U)] about the Republicans' [note position of apostrophe] agenda, or about what is expected of them. (If you believe political ads, there's a case for suggesting that they do tell you what to expect of the people who pay for them, but I'm not so sure. Is there an implicit 'We will do what we say' message? If there is, do you believe it? )