Apex is defined as:

Apex is defined as:

• A. Line
• B. Threshold
• C. Entry
• D. Apex

Answer: (D)

Apex is defined as the highest point or tip of something. The term captures the peak, summit, or crown of an object or shape. That’s why it’s the best choice here: it literally names the topmost point. The other options describe different ideas—line refers to a straight one-dimensional mark, threshold to a boundary or doorway, and entry to a way in—none of which convey the idea of the topmost point that apex means. So the correct choice is the one that matches the meaning of apex itself.

Apex is defined as the highest point or tip of something. The term captures the peak, summit, or crown of an object or shape. That’s why it’s the best choice here: it literally names the topmost point. The other options describe different ideas—line refers to a straight one-dimensional mark, threshold to a boundary or doorway, and entry to a way in—none of which convey the idea of the topmost point that apex means. So the correct choice is the one that matches the meaning of apex itself.