Answer:
(A) Catering to the interests of national party officials sometimes conflicts with serving the interests of a provincial or state official’s local constituencies.
Explanation:
The best assumption made by the argument is that the interest of the national party sometimes conflicts with the interest of the local citizens thus making the provincial officials or state officials fail in serving the interest of their local constituencies.
Option B and C is incorrect because the argument made does not suggest that elections are won only on the basis of serving national party interest and neither does the argument assert that the interest of local constituencies are well served only by elected officials who do not cater to the interest of national party officials.
Option D is also incorrect because not only does the argument not mention that elected officials should only cater for the interest of the constituency, elected officials also have a responsibility to the party on whose platform the won elections.
Option E is wrong, it is out of the focus of the argument.