The answer that i'd go with is A.Sunlight
Hope i helped
I do not know your choices but heres what i think....
sound waves travel faster thru solids due to their tight bonding
then liquids are second
then gas.
hope this help,if not the real answer will be in comments :)
the first answer as blood needs to be oxygenated to be passes round the body then when its deoxgenated it will return to the heart to be pumped around the body again
Answer:
A) Neither; they both have the same frequency.
