Instruction: Evaluate each product title in the given list, assess its relevance to the given query, and then arrange the products in descending order of relevance, with the most relevant product at the top of the ranked list.

Input:
Query: a-shirts undershirts
Product list:
A: Under Armour Men's HeatGear Tactical V-Neck Compression Short-Sleeve T-Shirt , White (100)/Clear , Large
B: Calvin Klein Men's Cotton Stretch Multipack Crew Neck T-Shirts, White, Large
C: Under Armour Men's Armour HeatGear Compression Long-Sleeve T-Shirt , Black (001)/White, Medium
D: adidas Men's Athletic Comfort Crew Neck Undershirt (3-Pack), White White White, MEDIUM
Answer: B,D,A,C