I thought Ian was going to lose it when she left . We told him in the morning that she was leaving and he was a fussy , clingy little boy all morning . When she left at lunch time , he clung to me with his little lip quivering getting ready to cry as she said good bye . He just kept blowing her kisses and quivering , I almost cried just watching him .

Based on the preceding passage, choose your answer for question Why is Ian sad that the woman is leaving ?
Available options:
(I) He is a baby , has intense emotions , and ca n't comprehend the reason for events.
(II) The woman was the only one who would take him to the zoo.
(III) None of the above choices ..
(IV) The woman was the one who would write his paychecks.
The answer is:
(I)