He impressed ____ his mind the words his father said to him that day

Đáp án B

Ta có: impress sth on sb: cố gắng làm ai đó hiểu tầm quan trọng của cái gì

Theo từ điền Oxford

Impress something on/upon somebody (formal) to make somebody understand how important, serious, etc. something is by emphasizing it

Eg: He impressed on us the need for immediate action.