It is known that a plastic block changes temperature by $5C$ when $1500*J$ of heat are transferred to$/$from it$.$ This block, starting at room temperature $(20C),$ is placed into an insulated jar that contains $0\mathrm{.}5$ kg of water at a temperature of $100C.$ Which of the following choices is closest to the final temperature?

A$.30C$

B$.40C$

C$.60C$

D$.80C$

E$.90C$