Помогите пожалуйста, очень необходимо 1. ___ of the American soldiers ___

Помогите пожалуйста, очень необходимо
1. ___ of the American soldiers ___ involved in military action.
А) A third was
Б) A third were
В) The third was
Г) The third were

2. This car is our ___ .
А) editor-in-chief
Б) editors-in-chief
В) editors-in-chiefs
Г) editor-in-chiefs