The following sentence has been split into four segments. Identify the segment that
contains a grammatical error and select the option which rectifies that error.
The SNAP-10 A / was launched on 3 April 1965 / on a Atlas-Agena D rocket / from
Vandenberg Air Force Base.

Correct option is D

The error lies in the segment "on a Atlas-Agena D rocket." The article "a" should be "an" because it precedes a word that begins with a vowel sound. Therefore, the correct option is: (d) on an Atlas-Agena D rocket.
· The corrected sentence is: "The SNAP-10 A was launched on 3 April 1965 on an Atlas-Agena D rocket from Vandenberg Air Force Base."