Select that combination of parts (A), (B), (C) and (D) which can fit into each other to form an equilateral triangle.

Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A, C and D only
Parts (A) and (C) together fill the notch under the arrowhead (D), and the three form a complete equilateral triangle, as shown below.
