Consider the two hypothetical reactions given below:I \[a\text{ }A\to \]Products, \[k=x\,mo{{l}^{-1}}\text{ }L\text{ }mi{{n}^{-1}}\]II \[bB\to \]Products, \[k=y\,mi{{n}^{-1}}\]The half-lives of both the reactions are the same, equal to 1 hr when molar concentration of the reactant is 1.0 M in each case. If these reactions are started at the same time taking 1M of the reactant in each case, the ratio [A]/[B] after 3 hr will be:

• A.  0.5      
• B. 4     
• C. 1                                 
• D. 2