While walking through the dark alley, the traveler was suddenly _____________ by a group of bandits.

Correct answer: set upon.
Complete sentence: While walking through the dark alley, the traveler was suddenly set upon by a group of bandits.
- অন্ধকার গলির মধ্য দিয়ে হাঁটার সময়, ভ্রমণকারীটি হঠাৎ একদল ডাকাত দ্বারা আক্রান্ত হয়েছিল।

• Set upon
- English meaning: to attack somebody suddenly.
- Bangla meaning: আক্রমণে উদ্যত হওয়া।

• Other options:
খ) Act upon
- English meaning: to use (something, such as a feeling or suggestion) as a reason or basis for doing something.
- Bangla meaning: অনুসারে কাজ করা।

গ) Call on/upon
- English meaning: to ask formally for someone to do something.
- Bangla meaning: সাক্ষাৎ।

ঘ) set about
- English meaning: to begin to do.
- Bangla meaning: আরম্ভ করা।

Source:
1. Accessible Dictionary by Bangla Academy.
2. Merriam-Webster Dictionary.