Final answer:
The sentence 'I love eating blueberries' contains a gerund phrase, which consists of the gerund 'eating' and its direct object 'blueberries'.
Step-by-step explanation:
The sentence that contains a gerund phrase is: 1) I love eating blueberries. In this sentence, "eating blueberries" functions as a noun, more specifically as the object of the verb "love." The gerund "eating" is combined with its direct object "blueberries" to form the gerund phrase.
As for the other sentences, they do not contain gerund phrases: Sentence 2) uses an infinitive phrase ("to eat blueberries"), sentence 3) has a simple direct object ("blueberries"), and sentence 4) presents a noun clause ("when blueberries are good").