In the sentence given below, there are three blanks. Each blank has to be filled with an appropriate article. Choose the option which has the most suitable set of articles that can fill all the blanks correctly.
As the selectivity index value of _______ extract increases, _______ ability of the extract to target _______ cancer cells rather than normal body cells also increases.
1
the, an, an
2
an, the, the
3
an, an, a
4
the, the, a