You can look at the words in front and behind it, because they refer to this big word. You may find a synonym of the word or a close reference. So for example in this sentence: I was excited and ambitious to learn about cars today. So this is a easy example. You can use exited to define ambitious if you dont know what ambitious means.
Unluckily, you missed to show her the choices in which we can choose our answers from. However, it must be noted that for oral presentation, one must be very knowledgeable about the topic at hand and be able to present it well by being confident in front of the audience.
Coherence in writing is the logical bridge between words, sentences, and paragraphs. Coherent writing uses devices to connect ideas within each sentence and paragraph.
So the best answer would be: the order of ideas enabling the reader to move easily from point to point
