【每日一题】大佬们进来看看吧

func main() {
    var ch chan int

    go func() {
        fmt.Println(<-ch)
    }()

    go func() {
        time.Sleep(3 * time.Second)
        ch = make(chan int)
        ch <- 1
    }()

    time.Sleep(10 * time.Second)
}

A 1 B 编译错误 C 无输出