In a scissors cross-over, the crossings provided are i) 2 obtuse angle crossings ii) 4 obtuse angle crossings iii) 4 acute angle crossings iv) 6 acute angle crossings The correct answer is A. (i) and (iii) B. (i) and (iv) C. (ii) and (iii) D. (ii) and (iv)

The correct answer is A. (i) and (iii).

A scissors cross-over is a type of knot that is formed by crossing two strands of rope in an X-shape. The crossings in a scissors cross-over are all obtuse angles, as shown in the diagram below.

There are two obtuse angle crossings in each scissors cross-over, as shown by the red arrows in the diagram. There are no acute angle crossings in a scissors cross-over.