Final answer:
The objective summary of the passage is that Eli's mom has sent him to his grandmother's because he has a bad attitude.
Step-by-step explanation:
The objective summary of the passage would be option A) Eli's mom has sent him to his grandmother's because he has a bad attitude. This summary accurately captures the main point of the passage, which is that Eli is sent to his grandmother's as a result of his behavior. The other options either focus on Eli's enjoyment of his trip, his writing of a thoughtful letter, or his being ungrateful and mad, which are not the central ideas of the passage.