Option 1: First-degree murder
In this scenario, if the robber intentionally killed the convenience store clerk, even if the motive was to steal just $5, it would typically be classified as first-degree murder. First-degree murder typically involves premeditation and intent to kill. The value of the stolen property is not the primary determinant of the degree of the crime in this context; it's the intention to commit murder that categorizes it as first-degree murder.