Answer:
a. sloths
b. I
c. owl; elephant
d. Laurie; Jaannie
Explanation:
A simple subject is a single noun or pronoun connected to a verb.
a. Three-toed sloths is a complete subject. Modifiers are not part of a simple subject. Therefore, sloths is the simple subect in A.
c. d. These sentences contain multiple simple subjects.
Owl is a simple subject in C, and elephant is also a simple subject in C. The multiple articles the are not included in simple subjects.
Laurie is a simple subject in D, and Jaannie is also a simple subject in D.