Answer:
He served in the Mexican American war
The correct answer is denial.
Denial is a defense mechanism in which an individual refuses to accept or believe something, because doing so would cause them great distress and emotional disturbance. In this instance, Mahmoud does not want to accept that his father has cancer due to which he denies the diagnosis and says that there has been a mistake in his father's diagnostic tests.
Yes and no. But mostly yes.
The Mayans impressively developed a concept of zero as a number and as a placeholder. They did so in the 4th century AD, and what makes it especially impressive is that they more or less did so on their own, without borrowing from or exchanging ideas with other civilizations.
However, unlike ancient India, who developed the concept of zero around the same time, the Maya never applied to to mathematical calculations, using it mostly as a placeholder and a concept in their complex calenders.
Zero really becomes a powerful force in science and math when you begin applying the concept to equations. A number times zero is zero, a number divided by zero can't exist but theoretically is infinite, etc. Although the Mayans never applied zero to their impressive advancements in geometry, construction, etc, they did invent the concept essentially from scratch, which is an impressive feat that few other societies accomplished in the ancient world.
C is the right answer for the question
