Do I need to write EVERY essay?

<p>I am a high school senior applying to several universities; many, require their own specific essays in addition to the standard Common App essays. Thankfully, I discovered ApplyTexas allows me to use the same essays for every school (without any writing supplements!). My question is, will I stand a chance in the Texas Tech University and the University of Texas at Austin admissions offices if I choose to write only two out of the three essays? (Topic C is required; there are two optional essays: A and B; I completed Topic A & C, but dread to write Topic B because I don't have anything to write that is applicable to the prompt)</p>