Correct option is C
The correct answer is "To hear some rumours about something".
· Meaning: This idiom means to hear unofficial news or gossip through informal sources rather than directly from the person involved.
· Example Sentence:"I heard on the grapevine that our manager is planning to resign."
· Similar Idioms: Word on the street, Through the rumor mill, Off the record
Correct Usage:
· Wrong: I heard it on the grapevine that she bought a new dress.
· Correct: I heard it on the grapevine that the company is laying off employees.