${}^{57}$Co decays by electron capture.Its half-life is $272$ days. The activity left after a year is (if present activity is 2$\mu$Ci)

Four different radioactive elements are kept in separate containers. In the beginning the container $A$ has $200$ g-atom with half-life of 2 days, $B$ has $20$ g-atom with half-life of $20$ days, $C$ has $2$g-atom with half-life $200$ days and $D$ has $100$ g-atoms with half-life of $10$ days. In the beginning the maximum activity exhibited by the container is: