Which of the following is an example of distance?
a. a bird flies at 5 meters per second.
b. a man is standing on a street corner.
c. a cat travels 5 meters from the front door of a house to the edge of the street.
d. a racecar increases its speed from 5 meters per second to 10 meters per second.

the answer to your question is:

c. complementary base-pairing

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.