Answer: 3. It suggests that the heat has real power to change its environment.
Explanation: Personification is a figure of speech that consists in giving human characteristics to nonhuman objects, or also it can be describing an abstract concept using human features. In the poem "Heat" by H. D. the author uses the personification of heat describing how it blunts the fruit as if it were a human being with the capacity to shape objects, and this personification suggests that the heat has real power to change its environment.
Passive voice: a form or set of forms of a verb in which the subject undergoes the action of the verb (e.g. they were killed as opposed to the active form he killed them ).