Final answer:
After Mr. White wished for his son to be gone, nobody was at the door except for the lions waiting in the veldt. The door was locked from the outside, trapping Mr. and Mrs. Hadley outside. Wendy had already gone into the nursery. Option 1 is correct.
Step-by-step explanation:
After Mr. White wished for his son to be gone, the consequence was that nobody was at the door when they ran into the nursery. Instead, the veldt was empty except for the lions waiting and looking at them. The door closed loudly and when Mr. and Mrs. Hadley tried to open it, they found that it had been locked from the outside. Peter pleaded with them not to let the nursery and the house be switched off. They beat at the door, but it was too late. Wendy had already gone into the nursery.