Read the following context and choose the best option to answer the question.
Context: 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 .
Question: What may be a plasuible fact about Jack ?
Options: 
A. None of the above choices .
B. Martha cares enough about him to be worried about his absence .
C. Jack decided to leave Martha and the Doctor behind .
D. Martha thinks he is irrelevent enough for her to leave without him .


B