Problem number 11. Which of the keys fits the lock shown in the picture? If we look at the lock head-on, we will see this pattern of a square, a triangle, and a circle. This is the pattern that the key needs to match. For example, we can eliminate A, C, and E because they don't have a square, a triangle, and a circle in that order from top to bottom. For example, A has a square, a triangle, and a square. C has a circle, a triangle, a square. And E has a triangle, a square, and a circle. So none of those match the pattern on the lock. Notice that B has the triangle pointing upside down, with the point of the triangle going towards the circle. This is the opposite direction it is shown in the lock, and this matches exactly what picture D shows, where the point of the triangle is pointing towards the square. This means that the answer is D.

lock

key

pattern

square

triangle