vivek.kapoor83 wrote:By observing the techniques of medicine men,
such as physical manipulation and the
application of herbs, one has the capacity to
learn things about the human body not normally
taken into consideration by practitioners of
Western medicine.
(A) By observing the techniques of medicine
men, such as physical manipulation and
the application of herbs, one has the
capacity to learn things - WORDY

(B) By observing the techniques of medicine
men, such as physical manipulation and
the application of herbs, one can learn
things

can is more concise than has the capacity

one is the subject, which was modified

(C) If you observe the techniques of medicine
men, such as physical manipulation and
the application of herbs, one can learn
things

pronoun issue

(D) Observing the techniques of medicine
men, such as physical manipulation and
the application of herbs, things can be
learned

passive + wrong subject

(E) Observing the techniques of medicine
men, such as physical manipulation and
the application of herbs, the capacity is
given to one to learn things