<em>In medias res </em>means in the middle of the action.
<em>In medias res</em> is a literary term that<u> is used to refer to a text that starts in the middle of the plot instead of starting with the beginning of the story</u>. When writers employ <em>in medias res</em>, they usually present the events that happened before by means of flashbacks or dialogue. Famous literary works such as Homer's <em>Iliad</em> and<em> Odyssey </em>and Shakespeare's <em>Hamlet </em>begin in medias res; in other words, <u>they go straight to the heart of the plot</u>.
Answer:
B, On September 23, 1999, NASA officials were aghast when the $125 million Mars Climate Orbiter vanished as it prepared to enter the red planet’s orbit.
Explanation:
The use of word imagery and mystery make this a good intro sentence. MAKE SURE IT MAKES SENSE THOUGH! I can't see which sentence is supposed to come after this, so make sure it makes sense with the paragraph