B.
Explanation: starting with the second one, every sentence in the passage makes the same point: there is no problem in the mayor's proposal to accept the gift. This is exactly what B says.
By process of elimination:
A - it is not the fear that the company
wants to influence the city which is unfounded, but rather the fear that they will succeed.
B - yes, this is what the second sentence expressly states, and the third and fourth sentences provide supporting claims.
C - this is the opposite of what is being claimed.
D - This is indeed implied in the last sentence, but it is
not the main conclusion: rather, it is only a supporting claim.
E - The fourth sentence does suggest this, but it by no means the main conclusion (as is clear by the connecting words "The only... I can find" - which make it clear this is a reservation, not the main point).