"He was too absorbed in his own thoughts to notice his wife's arrival." Identify the complex form of the sentence from the following options:

he was very absorbed in his thoughts and could not notice his wife's arrival

He was so absorbed in his own thouhts that he could not notice his wife's arrival.

He was absorbed in his thoughts neglecting his wife's arrival.

He was absorbed in his wife's thoughts and so he could not notice his wife's arrival.