An and a are indefinite articles and The is definite article.
<em>Indefinite articles</em> (an and a) are used for subjects which aren't specific. For example: a ball, a book, a table, a watch, a star, a plane, a man...
an airplane, an elephant, an apple, an egg, an orange...
<em>Definite article (The)</em> is used when we are describing something specific. For example: The air, the weather, the watch (When you know about what specific watch are you talking about), the book (specific book), the boys, the man...
The word AND is used as a conjuction, not an article.
Probably D. It is a pretty vague fact that you can give lots of information on, you dont wont to give all your information in the thesis, but you want it to catch your readers attention.
It is a LOGO, They are saying basically if you know not to jump infront of a train to know you'll die then why try drugs if you know there bad like why try and hit your head with a hammer if you know you'll bleed
