Answer:
Monica and Tinsel were two pieces of equipment that made the Avro Lancaster a good night time bomber.
Step-by-step explanation:
The reason why the Monica equipment was determinant for the Avro Lancaster to become a good night bomber was that it was a radar that allowed them to detect fighters near them. Now, the reason why the Tinsel was good for them to become good night time bombers was that it was a piece of equipment that allowed them to listen to the frequencies of the German fighters and anticipate them.