“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 thoughts 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