how would I asses this argument analysis? (for my philosophy 201 course)3

how would I asses this argument analysis? (for my philosophy 201 course)3. Adapted with slight alteration from a Washington Post letter to the editor (8/26/2015):Robbery is the crime that most threatens ordinary residents, because robberies are generally perpetrated on strangers, whereas homicides and assaults generally involve people known to each other.One good analysis of this argument is as follows:Constituent propositions:

1. Robberies are generally perpetrated on strangers.

2. Homicides and assaults generally involve people known to each other.

3. Robbery is the crime that most threatens ordinary residents.

Diagram:

1 + 2

↓

3

Taking this as a correct analysis, assess the argument.