Answer:
Option C will be correct i.e. parallel to line t.
Explanation:
See the diagram attached to this question.
It is given that segment DF is perpendicular to segment AB ....... (1)
Again as the line t is a tangent on the circle at point B and AB is the diameter
So, we can say segment AB is perpendicular to line t ....... (2)
Therefore, from the conditions (1) and (2), we can conclude that segment DF is parallel to line t.
Hence, option C will be correct. (Answer)