The boxed words are a compound subject.
In a sentence talking about people, the people are subjects of that sentence. Subjects are basically what is being talked about.
Because there are two people being talked about, Bob and Al, the subjects are counted as one, or compounded. This just means that you read the sentence as [Bob and Al] instead of [Bob] and Al.
Compound verbs follow the same concept, but for action words. For example, “to sing and to dance”. However, in this case since the boxed words are subjects, they are a compound subject.
This question is missing the options. I've found the complete question online. It is the following:
Which of the following statements is the inverse of "If you do not understand geometry, then you do not know how to reason deductively."?
A. If you reason deductively, then you understand geometry.
B. If you do not reason deductively, then you understand geometry.
C. If you understand geometry, then you reason deductively.
Answer:
The inverse of that statement is:
C. If you understand geometry, then you reason deductively.
Explanation:
To determine the inverse of a statement, we must negate both the hypothesis and the conclusion. In this case, the hypothesis is "if you do not understand geometry." It is already a negative sentence, which means its negation is "if you understand geometry." The same goes for the conclusion "then you do not know how to reason deductively." Its negation is "then you [know how to ] reason deductively." Putting them together, we have "If you understand geometry, then you reason deductively." - letter C
B- The subject is explaining why they waited in the long line
