Select from the following. [I] is being sliced along with a tomato to put in. [II] is being dipped in butter. [III] is shown in a bowl. [IV] is being cut on a bun.Choose from options above and answer: What most naturally follows?

Sandwiches are shown on a a plate. Turkey is shown being chopped. Celery is shown being chopped. A tomato is shown being sliced. mayonnaise
Answer:
[III]