'We will gain the triumph' best represents an opinion.
Answer: Option A
Step-by-step explanation:
Opinion is a person’s view about something which is not really based on any factual knowledge or data. Opinion is simply a belief or a person’s way of thinking. The sentence ‘we will gain triumph’ represents an opinion.
It is not a fact or an information, the line simply states that we will achieve success. It’s the belief that the speaker is holding. The rest two statements aren’t opinions, they are the factual information being provided to the readers. As in, ‘Yesterday the Japanese Government also launched an attack against Malaya’ this sentence expresses the fact and not an opinion.