In the active voice sentences the operator of an activity is the subject in the sentence, so in sentence A we can see how <em>Drew</em> as a subject operated a nerf gun and pulled the triger, where nurf gun and trigger represent the objects.
In the passive voice sentences, construction - <u><em>Object from the active sentence becomes subject of passive + verb TO BE in the appropriate tense + main verb (from the active) in Past Participle </em></u>- is characteristic. This pattern can be recognized in sentences B, C and D.
