সঠিক উত্তর: গ) apprehension.

• Fright: [noun]
English meaning: the feeling of fear, especially if felt suddenly, or an experience of fear that happens suddenly.
Bangla meaning: আকস্মিক প্রচণ্ড ভীতি; আতঙ্ক; ত্রাস; সন্ত্রাস; শঙ্কা।

Other options,

ক) Placidity: [noun]
English meaning: the fact of being calm and peaceful, with very little movement.
Bangla meaning: শান্ততা; প্রসন্নতা।

খ) Composure: [noun]
English meaning: the state of being calm and in control of your feelings or behaviour.
Bangla meaning: শান্তি; স্থৈর্য; আত্মসংবরণ।

গ) Apprehension: [noun]
English meaning:
- worry about the future, or a fear that something unpleasant is going to happen.
- an act of catching and arresting someone who has not obeyed the law.
- the act of understanding something, or the way that something is understood.

Bangla meaning:
- [Countable noun, Uncountable noun] আশঙ্কা; ভবিষ্যৎ বিষয়ে উৎকণ্ঠার অনুভূতি: filled with apprehension; an apprehension of failure.
- [Uncountable noun] (আইন সম্বন্ধীয়) গ্রেফতার: the apprehension of a thief.
- [Uncountable noun] উপলব্ধি; চেতনা; বোধ: apprehension of truth.

ঘ) Equanimity: [noun]
English meaning: a calm mental state, especially after a shock or disappointment or in a difficult situation
Bangla meaning: মনমেজাজের প্রশান্তি।

অপশন বিবেচনা করে দেখা যায়, Fright এর synonym হলো - Apprehension.

Source:
- Cambridge Dictionary.
- Accessible Dictionary.
- Oxford Dictionary.