I think the right one is A
Answer:
1 is 2 is formal 3 is d 4 is a
B, as there is no point in a comma there. There is already an and in the sentence which is a conjunction.
Answer:
Tuned means:
Explanation:
1. Adjust a musical instrument to the correct or uniform pitch
2. Adjust something such as a radio or television to the right signal
3. Adjust an engine or balance mechanical part on a vehicle so it runs smoothly.
4. Adjust or adapt something to a particular situation.
I think in this text it's definition 4, but that's just me.
Sorry I could only answer half of your question.
