The synapse between which two neurons is a part of a monosynaptic reflex arc?

Image is not available in the question. The image for the question is attached below:

A and B

Explanation:

Monosynaptic reflex arc consists of only two neurons, one motor neuron  and one sensory neuron. Monosynaptic means the presence of a single synapse of chemicals. Monosynaptic reflex Arc simple reflection that involves transferring input from the sensory neuron to the correct motor neuron through a single synapse in the spinal cord.

For example: the action of knee-je.rk reflex.

As the A refers to sensory neuron and B refers to motor neuron, sysnapse between A and B is a part of Monosynaptic reflex arc .

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.