----- rather tired after their long journey, they did not go to bed.
A
Although they were
B
As they were
C
Because they were
D
Since they were
Correct Answer: Although they were
Although যুক্ত বাক্যে দুটি বিপরীতমুখী অর্থ নির্দেশ করে। Because দিয়ে কারণ নির্দেশ করে। এক্ষেত্রে সঠিক উত্তর হবে - Although they are.