This is an Inference question. We should be able to directly refer to the passage and confirm our answer choice.
According to line 44-48, War Power Resolution of 1973 is "a statue designed to ensure that the collective judgement of both Congress and the President would be applied to the involvement of United States troops in foreign conflicts."
Having reminded ourselves what the Resolution is, let's go to the answer choices.
A) Indicated relation between the Resolution and the Constitution is stated in 59-64, where it says “by declaring that the resolution is not intended to alter the constitutional authority of either Congress or the President, the resolution asserts that congressional involvement in decisions to use armed force is in accord with the intent and spirit of the Constitution.” So, A) is wrong.
B) In a situation of declared war, the Constitution provides the president as a Commander in Chief. The passage presents how the Resolution empowers Congress' involvement in deploying troops, and putting some limit to the president's authority, but that doesn't necessarily mean it interferes the authority as a Commander in Chief.
C) Line 59-64 directly supports that the Constitution intends more involvement from Congress and the Resolution asserts this. They are in accordance with each other, thus explains C). (Correct)
D) According to line 50, this Resolution is designed for the case where there hasn’t been a declaration of war.
E) The opposite is true. Historically, president has been described as "not" following the intent of the Constitution, so the Resolution is designed to put a stop to this, not "confirm" what they have been doing.