_____ the polar icecaps melt many coastal cities and islands could be submerged.
A
For
B
However
C
If
D
Although
Correct Answer: If
_____ the polar icecaps melt many coastal cities and islands could be submerged. এখানে, could be দ্বারা সম্ভাবনা বুঝান হয়েছে । তাই শূন্যস্থানে If হবে ।