Answer:
Was
Were seen
Explanation:
Walt Disney WAS a clever businessman. His cartoons WERE SEEN all over the world
The answer is: change imply to implication.
Imply is a verb which means to indicate, point, reference or involve something by means of inference, which is to say, it is not explicit.
The correct word to use above would be “implication”, which implies the same meanings as above, but used in a grammatically correct way, that is to say, using it as a noun, not a verb.
Chronological order :) hope I helped