H2(g )+ 1/2O2(g) = H2O(L)
you can see the equation,
hydrogen in gas form and oxygen in gas form makes liquid water. There are stong bonding between Hydrogen and oxygen in water. And for combustion they must be in gaseous form.
And water removes heat and used as extenguisher
ᴡʜᴇɴ ᴛᴡᴏ ᴇʟᴇᴍᴇɴᴛs ᴄᴏᴍʙɪɴᴇ ᴛᴏ ғᴏʀᴍ ᴀ ᴄᴏᴍᴘᴏᴜɴᴅ, ᴛʜᴇ ᴘʀᴏᴘᴇʀᴛɪᴇs ᴏғ ᴛʜᴇ ᴄᴏᴍᴘᴏᴜɴᴅ ғᴏʀᴍᴇᴅ ᴀʀᴇ ᴅɪғғᴇʀᴇɴᴛ ғʀᴏᴍ ᴛʜᴇ ᴘʀᴏᴘᴇʀᴛɪᴇs ᴏғ ᴘᴀʀᴇɴᴛ ᴇʟᴇᴍᴇɴᴛs.
ᴛʜᴇʀᴇғᴏʀᴇ, ᴛʜᴏᴜɢʜ ʜʏᴅʀᴏɢᴇɴ ɪs ᴄᴏᴍʙᴜsᴛɪʙʟᴇ & ᴏxʏɢᴇɴ ʜᴇʟᴘs ᴄᴏᴍʙᴜsᴛɪᴏɴ, ᴛʜᴇ ᴡᴀᴛᴇʀ ʜᴇʟᴘs ᴛᴏ ᴇxᴛɪɴɢᴜɪsʜ ᴛʜᴇ ғɪʀᴇ. ʜᴇʀᴇ, ʜʏᴅʀᴏɢᴇɴ ᴀɴᴅ ᴏxʏɢᴇɴ ʜᴇʟᴘ ᴄᴏᴍʙᴜsᴛɪᴏɴ ʙᴜᴛ ᴛʜᴇɪʀ ᴄᴏᴍᴘᴏᴜɴᴅ ʀᴇᴅᴜᴄᴇs ᴄᴏᴍʙᴜsᴛɪᴏɴ.
the answer is option b
both the substances are oxidized because both the substances had been added with an electron .