Select the phrase/connector/word-pair from the given three options to form a single sentence from the two sentences given below, implying the same meaning as expressed in the original sentences. The phrase/connector must appear at the beginning of the final sentence.
I. Russia often takes action that irritates Western rivals.
II. There is still a limit to how far the Russians are likely willing to go. (i) Although (ii) But (iii) Still

'Although' and 'but' are used to indicate contrast in tone of the sentence. The two given sentences have a contrasting relationship (The sentences talk about Russia's intentions for irritating rivals through their actions, but also, they have some limits to it.), but 'but' needs a sentence before it to show contrast, hence it can't be used. 'Still' is used for saying that a situation continues to exist up to and including a particular time, especially when this seems surprising. 'Still' also needs a sentence before it. C is the answer. "Although Russia often takes action that irritates Western rivals, there is a limit to how far they are likely willing to go."