The government has imposed sanctions and restricted foreign aid to a renegade nation last month after it violated the terms of a worldwide arms control treaty.

(A) has imposed sanctions and restricted foreign aid to a renegade nation last month after it violated
(B) has imposed sanctions on and restricted foreign aid to a renegade nation last month after it violated
(C) imposed sanctions on and restricted foreign aid to a renegade nation last month after that nation violated
(D) imposed sanctions and restricted foreign aid to a renegade nation last month after violating
(E) had imposed sanctions and restricted foreign aid to a renegade nation last month after it had violated

C makes most sense.
Although this question is from Kaplan, there is no major issue in the question. Also, no common pattern is here.