For each of the sentences given below, identify which of the two underlined words/phrases is correct:

"Free rein" (A) → Means giving full freedom. "Reign" is about ruling, which doesn’t fit.

"Vise" (D) → A tool that tightly grips something (used metaphorically for a squeezing feeling). "Vice" means a bad habit.

"Wringer" (E) → "Put through the wringer" means going through a tough time. "Ringer" means an impostor, which doesn't fit.

"Toe the line" (H) → Means to follow rules. "Tow the line" is incorrect because "tow" means pulling something.

Hence, the correct option is option C.