Performing in the best way with little wasted effort A hostile
B vow
C treacherous
D efficent

the answer is D i hope this helps and have a great day

feel free to brainliest

Explanation:

to change your profile

1. hit your picture thing on the top right corner (that's where mine is).

2. there should be options under it, so hit "edit profile".

3. it'll bring you to a page that gives you these options: "preferences", "send info to email", "password",   "your email", and "profile picture". click "profile picture".

4. hit choose file.

5. click your picture you'd like and hit change!

i hope this and makes sense! good luck!

b. he wants to keep from being identified by former masters.

explanation: