Read the following article and answer the question by choosing from the options.

I calmly walked back over pounded on the window six times and waited , I even called out " Stephen are you all right . " He knows you can see through the blinds up close , but she did n't . I saw him get up , get dressed and then the next thing I know he is opening the front door , so I walk over to meet him .

Why did I knock on the glass ?
pick from the following.
1). To make sure it was locked .;
2). None of the above choices .;
3). To see if it was sturdy .;
4). To loosen it for refitting .;...A:
2).