[单选题]Choose the closest paraphrased version after each of the following sentences or the italicized part. Blacken the letter corresponding to your choice on the answer sheet.  From the lifeboat's stern, where I'd sat most of the twenty days of our drifting, I could keep them all covered.（） A  …they were all within my hearing range B …I could aim my gun at each of them C …they were all under my protection D …could keep an eye on all of them