The correct answer is D. Coordinating
Explanation:
A conjunction is a word or phrase that is used to connect different elements in a sentence. These conjunctions are mainly classified into subordinating conjunction, coordinating conjunction and correlating conjunctions. In the case of coordinating conjunctions these are used in compound sentences or to link ideas with the same importance and include the conjunctions and, so, or, and but that is the conjunction used in the sentence "I have always loved animals, but I am allergic to cats and my sister is allergic to dogs" to link two ideas of the same importance that are "I have always loved animals" and "I am allergic to cats and my sister is allergic to dogs". Therefore, the type of conjunction, in this case, is a coordinating conjunction.
