Aby blood and iron
Bwith bad blood
Cof blue blood
Din cold blood
Answer:
D. in cold blood
Read Explanation:
Option A: by blood and iron
Explanation: INCORRECT. This is an idiom referring to a forceful, militaristic policy of governance, not the act of killing individuals. It describes a method of rule, not a method of murder.
Example: The empire was unified by blood and iron.
Option B: with bad blood
Explanation: INCORRECT. "Bad blood" refers to feelings of bitterness, hatred, or rivalry between people or groups. It describes a relationship, not the act of killing itself.
Example: There is bad blood between the two families, which has lasted for generations.
Option C: of blue blood
Explanation: INCORRECT. "Blue blood" is a noun phrase meaning someone of noble or aristocratic descent. It cannot be used to describe the manner of an action like killing.
Example: He was a man of blue blood, born into a life of privilege.
Option D: in cold blood
Explanation: CORRECT. This is a fixed adverb phrase meaning "in a cruel, deliberate, and unemotional way, without any mercy or provocation." It perfectly describes the manner in which the killings are carried out.
Example: The victims were executed in cold blood.
