Which phrases make this statement from John F. Kennedy's Inaugural Address an example of antithesis?

a. riding the back of the tiger and ended up inside

b. supporting our view and supporting their own freedom

c. we shall not always and we shall always

d. strongly supporting and foolishly sought

An antithesis is a statement that reverses the previous statement: it says the exact opposite of what was said before.

Among the options, the clearest example of an antithesis is the following statement:

c. we shall not always and we shall always

a) can be seen as a contradiction too, but it's not an antithesis