As I was at that time but eighteen years of age, I know not whether I should call my behaviour, in this dangerous juncture, courage or folly. –Letter to Cornelius Tacitus, Pliny the Younger What makes this statement an opinion? It gives the writer’s exact age. It can be proven to be true. It expresses the writer’s personal feelings. It provides evidence to support the idea

See below

Explanation:

This is an opinion because they’re describing their own behavior. Someone else could describe their behavior differently. Also, in the question it literally says it expresses the writer’s personal feelings.

Sorry if this isn’t a good answer. Hope this helps a little bit.

it was on the rise and doing very well and would continue to do well until the great depression from 1929-1939