I believe the answer is War Hawks.
Answer:
Pledging to vote for a candidate would be only positive for this candidate: so we have to choose an option that would not be a positive outcome for this candidate.
Such an option is "making the candidate appear weaker" and indeed, pledging to vote for a candidate would not make this candidate appear weaker. (answer B)
Explanation:
Railroads and Turnpikes were primarily constructed for profit.
