[1]Our son has started playing organized T-ball, a beginner’s version of baseball. [2] “Organized” is what parents call it, anyway. [3] Joe is seven, living in those two or three years when children can manage to throw a baseball a few feet but when what they’re really interested in are things closer at hand: bugs, butterflies, dirt (if they’re in the infield), grass (if they’re in the outfield). [4] Children of that age still think nothing of doing little dances in the outfield, often with their backs to home plate and, consequently, the batter. [5] It’s not as if the outfielders’ positions matter much, though—the ball never gets hit hard enough to reach there. The writer wishes to add the following sentence in order to emphasize the uncertainty already expressed about an idea in the paragraph:

I still have doubts.

The new sentence would best amplify and be placed after Sentence:

A: 1.

B: 2.

C: 3.

D: 4.