The correct answer is C. Only I and II follow.
The first statement is “Some tigers are lions.” This means that there is at least one tiger that is also a lion. The second statement is “Some lions are rabbits.” This means that there is at least one lion that is also a rabbit. The third statement is “Some rabbits are horses.” This means that there is at least one rabbit that is also a horse.
The first conclusion is “Some tigers are horses.” This is a valid conclusion because the first statement tells us that there is at least one tiger that is also a lion, and the second statement tells us that there is at least one lion that is also a rabbit. Therefore, there must be at least one tiger that is also a rabbit, and therefore at least one tiger that is also a horse.
The second conclusion is “Some rabbits are tigers.” This is also a valid conclusion because the first statement tells us that there is at least one tiger that is also a lion, and the third statement tells us that there is at least one rabbit that is also a horse. Therefore, there must be at least one rabbit that is also a lion, and therefore at least one rabbit that is also a tiger.
The third conclusion is “Some horses are lions.” This is not a valid conclusion because the first statement tells us that there is at least one tiger that is also a lion, but the second statement does not tell us that there is at least one horse that is also a tiger. Therefore, we cannot conclude that there is at least one horse that is also a lion.
The fourth conclusion is “All horses are rabbits.” This is also not a valid conclusion because the third statement tells us that there is at least one rabbit that is also a horse, but the second statement does not tell us that there is at least one horse that is also a rabbit. Therefore, we cannot conclude that all horses are rabbits.