I think it's the first option.
Here, you would need to add the preposition "in."
The sentence should read: My elder sister is really interested in the problems of the environment.
Other prepositions would not make sense and could confuse the reader as to the intended meaning.
A contribution of the French Revolution to English thought was the idea and goal of equality for all.
Answer:
She Will Be Ok With What You Propose
Explanation:
Respected mom (mother, as you wish to write),. You will be glad to know that my examination has come to an end. But Remember it won't work all the time ''you people who have tough parents''
I'm sorry but there is not enough material for me to answer your question
