<span>mochila is feminine, thus, la for singular, las for plural so if it is a definite article, and una or unas if it is indefinite article.</span>
Answer:
Its the third one
Explanation:
Its saying that they were controversial.
1 tienen
2 estoy
3 esta
4 estan
Answer: Yo soy optimista
I am optimistic
Explanation: The subject in this sentence is "Yo", that is a first-person in the singular, so the verb must be conjugated in this form. Yo soy.

My book is The Lord of the Rings.