Answer all please

Diana placed a drop of blue ink into a narrow glass tube. The glass tube was inserted into a rubber bung which was fitted into an empty conical flask.

(a)  The conical flask was then placed in a basin of hot water. What would Diana observe ?
(b)  What would Diana observe if the flask was placed in a basin of ice water ?
(c)  What does this experiment show ?
(d)  Ink solution is bad conductor of heat. Yes / No.