Two cars of masses \[{{m}_{1\,}}and\,{{m}_{2}}\] are moving in circles of radii \[{{r}_{1\,}}and\,{{r}_{2}}\], respectively. Their speeds are such tha they make complete circles in the same time t. The ratic of their centripetal acceleration is

• A. \[{{m}_{1}}\,{{r}_{1}}\,:\,{{m}_{2}}\,{{r}_{2}}\]      
• B. \[{{m}_{1}}\,:\,{{m}_{2}}\]
• C. \[{{r}_{1}}\,:\,{{r}_{2}}\]                   
• D. \[1\,\,:\,\,1\]