Final answer:
The simple subject in the sentence is the noun or pronoun that performs the action of the verb, and the simple predicate is the verb that expresses the action or state of being in the sentence.
Step-by-step explanation:
The simple subject in the sentence is the noun or pronoun that performs the action of the verb. The simple predicate, on the other hand, is the verb that expresses the action or state of being in the sentence.
In the given options, the correct answer is Option 1: Mr. Mota; sampled. Mr. Mota is the simple subject, and sampled is the simple predicate.
Option 2: He; bought, treats is incorrect because it has two simple subjects (He and doggie treats) and two simple predicates (bought and treats).
Option 3: The friendly cashier; smiled is incorrect because it has two simple subjects (The friendly cashier and cashier) and two simple predicates (smiled and The friendly cashier smiled).