In which situations the word "Messrs." is not used in the inside name and address?
选项：

A:when the letter is addressed to an individual instead of a company.;
B:when the firm's name(the receiver) begins with the definite article "The".;
C:when the firm's name begins with the courtesy word, such as "Dr.".;
D:when the name of a firm which contains a personal element.