Which is the best example of solid deductive reasoning?

Statments

All dolphins are mammals.  

All mammals have kidneys.

All numbers ending in 0 or 5 are divisible by 5. The number 35 ends with a 5, so it must be divisible by 5.

All birds have feathers. All robins are birds. Therefore, robins have feathers.

It's dangerous to drive on icy streets. The streets are icy now, so it would be dangerous to drive on the streets.

All cats have a keen sense of smell. Fluffy is a cat, so Fluffy has a keen sense of smell.

Cacti are plants, and all plants perform photosynthesis. Therefore, cacti perform photosynthesis.

Red meat has iron in it, and beef is red meat. Therefore, beef has iron in it.

Acute angles are less than 90 degrees. This angle is 40 degrees, so it must be an acute angle.

All noble gases are stable. Helium is a noble gas, so helium is stable.

Elephants have cells in their bodies, and all cells have DNA. Therefore, elephants have DNA.

All horses have manes. The Arabian is a horse; therefore, Arabians have manes.

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