what is oxidized in photo synthesis? and What is reduced in photosynthesis?

Question

a) water
b) carbon dioxide
c) glucose
d) ATP


these are the same choices for two different questions. this was on my test and im not sure what the answers are

Answer 1

Water is oxidized and carbon dioxide is reduced. This is stated in the beginning of this website:
http://www.lycos.com/info/photosynthesis--energy.html?page=2

Answer 2

Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP, the "fuel" used by all living things. The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll. Most of the time, the photosynthetic process uses water and releases the oxygen that we absolutely must have to stay alive. Oh yes, we need the food as well!


Here is the link that will explain photosynthesis