Final answer:
The phrase 'rescuing the princess' is the gerund phrase with 'rescuing' acting as a gerund. 'Milo is transfixed by the frightening demons' uses the word 'transfixed' correctly. 'An unhealthy diet can lead to a vitamin deficiency' uses the word 'deficiency' appropriately, and 'critical' is the word most similar to 'admonishing'.
Step-by-step explanation:
Gerund phrase identification requires looking for a verb that is used as a noun. In the sentence provided, 'Rescuing the princess' is the gerund phrase, where 'rescuing' functions as a gerund, and 'the princess' is the object of the action. The gerund phrase as a whole is the subject of the sentence.
When considering the proper use of the word transfixed, it refers to being motionless or captivated due to shock or amazement, not a transformation or being physically attached to a place. Therefore, 'Milo is transfixed by the frightening demons' uses the word correctly, describing a scenario where Milo is captivated by the demons.
The word deficiency is correctly used in 'An unhealthy diet can lead to a vitamin deficiency.' This sentence correctly utilizes the word to indicate a lack or shortage of vitamins.
Among the given choices, the word most similar to admonishing is 'critical.' Admonishing entails reprimanding or warning someone critically about their actions.