Two particles start moving from rest from the same point along the same straight line. The first moves with constant velocity v and the second with constant acceleration a. During the time that elapse before the second catches the first, the greatest distance between the particles is

• A. \[\frac{{{\text{v}}^{2}}}{a}\]             
• B. \[\frac{{{v}^{2}}}{2a}\]
• C. \[\frac{\text{2}{{\text{v}}^{2}}}{a}\]              
• D. \[\frac{{{\text{v}}^{2}}}{4a}\]