Which of the following chemical reactions produces water via a synthesis reaction?
a 2H2 + O2 + 2H2O
b NaOH + HCI - NaCl + H2O
C CuO + H2 - Cu + H2O
d H2CO3 → CO2 + H2O

Should be A, but also I think there should be an arrow between O2 and 2H2O

c. 75.7

i think that is the right

ok whats the question if not i cannot you i need question and need a thing to answer