Q: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
[header] How to choose an air duct cleaning company [title] Research the background and experience of air duct cleaning companies. [substeps] Ask companies how long they have been in business to determine their experience with cleaning air ducts. If the company itself is newer to the air duct cleaning business, ask the employees about their prior experience. <sep> (A) They will provide you with more information, making you feel more comfortable. Some air duct cleaners offer positions online. (B) Ask companies for referrals from past clients to see if customers were satisfied with their service. You may also ask your friends, neighbors, or other homeowners for recommendations or referrals for air duct cleaning companies. (C) You can find air duct cleaning companies in the us by visiting https: // www.hydrorajunctotour and searching " air duct cleaning " in the " contact us air duct cleaning company " section. [title] Research potential location for air duct cleaning companies. (D) Familiarize yourself with your company and its competitors so you can make an informed decision about renting your space. [title] Find locations for air duct cleaning you can rent and specify your situation.
A:
B