Which word is an interjection?

ouch! that thorn on the rosebush scratched my finger and my wrist.

a.
on

b.
ouch

c.
and

d.
that

Based on the book, "the boy in the striped pajamas."describe how these circumstances would affect a person’s identity development (crisis, commitment, diffusion, foreclosure, moratorium, achievement.)

Within a farewell to arms, what would be the best definition of the word “regiments”?

Based on this chart, how many details should each event contain on the time-order chart? (site 1)