Hi , the answer is D because the moon is blocking the sun s rays . 
<span />
        
             
        
        
        
Answer:
The coefficients are 2 for H₂O and 1 for Ca(OH)₂.
Explanation:
Let's consider the following reaction.
Ca(OH)₂(aq) + 2 HCl(aq) → CaCl₂(aq) + 2 H₂O(l)
According to the balanced equation, the molar ratio of H₂O to Ca(OH)₂ is 2:1. Using this conversion factor, we have the following proportion:
moles Ca(OH)₂. (2 mol H₂O ÷ 1 mol Ca(OH)₂) = moles H₂O
 
        
             
        
        
        
potassium reacts the most vigorously.
 
        
             
        
        
        
H2SO3 or sulfurous acid is actually a strong acid. We know
for a fact that strong acids completely dissociate into its component ions in a
solution, that is:
 
<span>H2SO3 -->  2H+  +  SO3-</span>
 
<span>So from the equation above, there are 2 moles of H+</span>