My grandchildren have changed a lot in the last year - they are growing up , after all , as children tend to do . Last year , Luka still needed some help with dressing , toileting , and had to be watched pretty closely . Now he 's running around with the rest of the crew , playing hard and enjoying being a boy .

Based on the preceding passage, choose your answer for question Why is Luka showing more confidence lately ?
Select from:
[1]. He has had children of his own .
[2]. He is a man .
[3]. None of the above choices .
[4]. He is getting older .
The answer is:
[4].