Select the most appropriate option to fill in blank number

Explanation

The sentence should read: “This, however, we had to stop for, either you carried him on your shoulder or else you let him walk behind.” The word “either” is used to indicate one of two options, which fits the context of choosing between carrying Ari or letting him walk behind. The other options are incorrect: (1) neither implies that neither option is true, which contradicts the sentence, (3) never means at no time, and (4) ever means at any time, neither of which fits in the actual context of the passage.