Answer:
Explanation:The words establish the author of the article as an expert on cookstoves.
The words imply that cookstoves are something negative.
The words show that people in developing countries dislike cookstoves.
The words hint that cookstoves are not as bad as many people believe they are.
This is a simple sentence
Assuming the italicized clause is <em>Since its establishment, </em>the correct answer here is elliptical clause.
Elliptical means that a word which would normally be part of a sentence is excluded, usually for stylistic reasons. Here, the verb is missing, which is why it is elliptical. The question is oddly formulated too - given that there is no verb here, it cannot be a clause, but rather a phrase, but since there is no such option here, then the correct answer is elliptical clause.
