Answer:

c.

Explanation:

correct me if you am wrong

Answer:

A. formality

Explanation:

noun

the rigid observance of rules of convention or etiquette.

"he retained the formality of his social background"

stiffness of behavior or style.

"with disconcerting formality the brothers shook hands"

Similar:

ceremony

ceremoniousness

ritual

conventionality

red tape

protocol

decorum

stateliness

courtliness

solemnity

etiquette

aloofness

reserve

remoteness

detachment

unapproachability

stand-offishness

stiffness

primness

stuffiness

staidness

correctness

punctiliousness

inflexibility

reticence

taciturnity

antisocial nature

Opposite:

informality

a thing that is done simply to comply with requirements of etiquette, regulations, or custom.

plural noun: formalities

"legal formalities"