Answer:
Option 1
Step-by-step explanation:
The order of facts in the given paragraph are as follows -
a) The female hornbill lays eggs in a hollow tree
b) Male then covers the opening by plastering it with mud
c) Male gives food to young ones through a hole.
d) Female stays in the cell like compound for three weeks until the young ones are big enough.
Considering the above flow of facts, option 1 is the most appropriate answer