How did the suez crisis affect perceptions of the united states and its allies?

The right answer for the question that is being asked and shown above is that: "C. They proved willing to use brutal force to end a conflict."

Here are the following choices:
A. They no longer appeared to be a unified front.
B. They seemed weak and willing to negotiate.
C. They proved willing to use brutal force to end a conflict.
D. They appeared to support the Zionist mission.

What does this mean ? ?