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The pill camera, a tiny camera inside a capsule capable of being swallowed, can now be used to take snapshots inside a human digestive tract; scientists believe that someday, tiny capsule-borne machines will perform tasks such as conducting biopsies, diagnosing illnesses, and to administer medication.

(A) diagnosing illnesses, and to administer
(B) diagnosing illnesses, and administering
(C) diagnose illnesses, and administer
(D) to diagnose illnesses, and to administer
(E) diagnosis of illnesses, and administration of

Official Explanation:

Answer B - The correct answer choice must express the series of three items "conducting biopsies, diagnosing illnesses, and to administer medication" in parallel form. (B) is the only choice that does so.

(A) uses the non-parallel "diagnosing . . . and to administer."

(C) uses the non-parallel "conducting . . . diagnose."

(D) uses the non-parallel "conducting . . . and to diagnose."

(E) uses the non-parallel "conducting . . . and diagnosis of."
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