The editor-in-chief asked me to write another article for them, _____ about how to prevent bird flu.

A．that         B．one            C．it                 D．which

The editor-in-chief asked me to write another article for them,        about how to prevent bird flu.

A．that          B．one           C．it              D．what

The editor-in-chief asked me to write another article for them, ________ about how to prevent bird flu.
A. that       B. one      C. it      D. what

The editor-in-chief asked me to write another article for them,_______ about how to prevent bird flu.

  A.that                      B.one                          C.it                D.what

The editor-in-chief asked me to write another article for them, ________ about how to prevent bird flu.
A. that       B. one      C. it      D. what