Answer:
B. The pencils
Step-by-step explanation:
Every pencil on her desk was lined up perfectly is a clear sign of the need of order and control in her life. Beyond the perfect alignment, she wants to know if someone touches HER things.
A. Glaring at others, is more like saying "Don't bother me, I'm busy!" to the other persons present, but it's not a sign of control need by itself.
C. The letter, is not even opened... so we don't know what is her reaction to it, but it's clearly not a sign of control need either.
D. Tapping fingernails, is a universal sign of impatience, when you are waiting for something or when things don't go as you want.