Answer:
1. B, Unity of command
2. C, Authority
Explanation:
1. According to Fayol's principle of unity of command, he stated that "“As soon as two superiors impose their authority over the same person or department, uneasiness makes itself felt".
This principle means that just one superior is enough to command a person or department which could lead to clash of command amongst other things and could bring about uneasiness which in turn reduces the output of the person or group.
2. When a worker is being held accountable for his/her actioons, it is done by a superior who has the AUTHORITY to do so. Workers on the same level or in different departents can't make a fellow employer accountable to him/her. Only a superior has that authourity.
I hope this helps.