Which sentence uses a conjunctive adverb?

The flowers on the altar were given to the church too late for the morning service; instead, we'll use them in the evening service.
The flowers on the altar were given to the church too late for the morning service, but we'll use them in the evening service.

the answer is b. the tracer looks harmless in flight, but the pilot’s bitten lips and white knuckles suggest how dangerous it can be.

it would be d because the however is more proper and the comma is placed in the right spot

it shaped life in both positive and negative ways. the positive sides of the medieval government was that it had a very strong and military. the citizens felt safer because of the high military interference. the citizens also had a positive attitude towards the artisan class and gave a huge respect to them. there is also a negative side of the government where the government would use the military too much on its citizens which created a sense of autocracy. it was oppressive to the peasants especially to the women.