Answer: The law of logic used in this case is the modus ponens, which states that if "p implies q" is a true statement and p is true, then q must also be true.
Given the statement "If two lines are parallel, then they do not intersect" and the fact that "Line t and line s are parallel", we can conclude that:
A. Line t and line s do not intersect.
Therefore, the best answer is A.
Explanation: