The Doctor looked back when they made it , and saw that the ski lodge was gone . That was n't all , however : the mountain was now disappearing at about the same rate . " Where 's Jack ? " asked Martha , worry in her eyes . " He 'll be here , " said the Doctor .

Based on the preceding passage, choose your answer for question What may be a plasuible fact about Jack ?
Choose from:
- None of the above choices ..
- Martha cares enough about him to be worried about his absence ..
- Jack decided to leave Martha and the Doctor behind ..
- Martha thinks he is irrelevent enough for her to leave without him ..
The answer is:
Martha cares enough about him to be worried about his absence .