I'm not sure who you are talking about or in what context "one way street" is used, but as it is usually used for is for explaining or describing a person or what have you to be straight, practical, black and white, no room for a "change in direction" you might say. i hope this helps... sorry that it's 3 hours late XD
Answer: The adverb used is: "sadly" .
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C is the answer. It is what someone personally thinks.
To admonish is to warn somebody firmly.
To dissent is to hold opinions that are different or against someone else's view(s).
Tangent is a straight line.
Vociferate is to shout or complain loudly.
Therefore the correct choice would be C, Tangent.