Instruction: Evaluate the relevance of each product title in the input to the given query, and then sort the products in descending order of relevance, placing the most relevant product at the top of the ranked list.

Input:
Query: qsc speakers
Product list:
A: QSC AD-S402T 2.75" Columnar Surface Mount Loudspeaker (White)
B: Electro-Voice ZLX-12BT 12" 1000W Bluetooth Powered Loudspeaker
C: QSC PLD 4.2 700 Watt Four Channel Power Amplifier
Answer: A,B,C