Identify the simple subject having one subject and one verb.
Select “yes” if it matches the requirement or else select “No”.
The teacher taught and left the classroom.

The correct answer is: No

Solution : Option (b) No
"The teacher taught and left the classroom" . Here, "The teacher " is the only subject , but it has more than one verb "taught and left" . Though, it is a simple sentence but with one subject and compound (more than one) verbs. So, it does not justify the condition of one subject and one verb.