题目

Briana, a student at John Fenwick School in Salem County, US, has a lot of free time. The 13-year-old girl used to hang out on the streets after school. “I know it wasn’t good, but I really had nothing else to do,” Briana said.SyeadaWoods(L)and Briana.  Briana was not alone. Many kids in her city had too much free time and nothing to do. To solve this problem, four school districts in Salem began a program called Big Brothers/Big Sisters. The program helps students make good use of their after-school time. Big Brothers/Big Sisters invites mentors to help students in grades 6 to 2．下面哪个数既是2的倍数，又是5的倍数．（　　）A．45B．24C．30D．125