The answer is: Joseph
was unhappy, and then the phone rang.
This is an invalid
cause-and-effect sequence because the 2 independent clauses don’t follow. There
was no particular reason stated explaining why Joseph is not happy. The phone
ringing has nothing to do with his emotional state.
The rest of the
options make sense, except for this.
<span> </span>
Best is the correct answer because that is the correct superlative form of the adjective "good". Here we use the superlative to show that he was the best of all the students.
