I'm sorry for the question which looks incomplete.
This is one of the questions in the exam.
The question is as below.
[It is to seek advantage by attributing to our opponents a weak or indefensible position they don't hold but which resembles their position in some respects. That's called ( ) and it's a common ploy in politics especially.
1) creating a straw man
2) giving a person the slip
3) beating around the bush
4) offering an slippery slope]
The answer is 1).
I understand all the sentences but 4).
I don't know of "offering a slippery slope" as a set phrase, but our dictionary has the following definition for slippery slope:
slippery slope a course of action likely to lead to something bad.
You can find examples of the phrase in context by following these instructions: Finding Examples in Context.
Looking over the examples you find may answer your question. You are also welcome to ask a question about any of those sentences.
Slippery slope arguments go along the following lines: actions of a certain type may seem all right, but if we permit them, we will be led to permit further actions of related types, which are not all right; therefore, we shouldn’t permit the first actions.