Intrepid means fearless and transitory means
fleeting, so neither of those words apply. Extrinsic means external
(think of ex); extrinsic is a possibility because if something is subjective
(personal), then it is not extrinsic. Uncanny means startlingly strange,
so that would not fit in. Observable is a possibility because a personal
experience could not be observed from the outside. The two choices
you have for the second blank are accepted and substantiated. You
know that, because extrasensory experiences are personal, they cannot
be proven scientifically. Substantiated is a better synonym than
accepted because the matter of accepting something is personal, while substantiating
something deals more with an objective study. E is the correct
answer.