Answer:
Leading
Explanation:
The word tangent in this sentence automatically makes me think of the word leading. Based on the actual definition:
Tangent = "a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.
"
This eliminates the first answer since it's "straight." The second and third answer choices don't make sense in the given statement, leaving you with, leading, as your final answer.
