Concept:Reflexive pronouns show that the action of the verb is done by the subject to itself.
Explanation:The sentence talks about “Those boys” being responsible for their own actions.
When the subject is plural and the action refers back to that same group, we use the plural reflexive pronoun “themselves”.
“Each other” is used for two or more people doing something to one another.
“Ourselves” refers to the speaker’s own group, which does not match “those boys”.
“The other” is not reflexive and cannot be the object of “blame” here.
So the correct word is “themselves”.
Answer:D. themselves