Final answer:
The most likely misplaced modifier in the sentence is 'with one hand.'
Step-by-step explanation:
The modifier in the given sentence that is most likely misplaced is the phrase 'with one hand.' This phrase should be placed immediately after the verb 'threw' to indicate how the action was performed. Therefore, the correct sentence should be: 'He threw the ball with one hand to his brother.'
The modifier 'to his brother' correctly describes the direction of the action and is in the correct place in the sentence. The subject 'He threw' is also in the correct position. Hence, the most likely misplaced modifier is 'with one hand.'
As a general rule, modifiers should be placed as close as possible to the word or phrase they modify to avoid confusion or incorrect meaning.