Answer:
The correct answer is C. To serve well, senators need to have knowledge of many state and national issues.
Step-by-step explanation:
Senators are the members of Congress who represent the states as territorial entities, while the Representatives are the ones who represent the population of each state.
Therefore, senators deal with issues of national relevance, representing their states. It is for this reason that they must have a thorough knowledge not only of the affairs of their state, but also of the affairs of the country in general.