The diaphyseal region of bone is composed of which of the following bone types?
a) spongy
b) cancellous
c) cortical
d) trabecular

( C ) Cortical bone

Explanation:

The diaphyseal region of the bone , is the main or the medsection of the long bone.

The composition of Diaphyseal region is mainly of the cortical bone , bone marrow and the fat tissue i.e. the adipose tissue .

The middle tabular part of the diaphyseal region , composed of the compact bone is surrounded by the central marrow cavity which have the red or the yellow marrow.

Hence ,  

The diaphyseal region is composed of cortical bone.

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