Given below is diagrammatic representation of an actin filament (thin filament) with labelled parts A, B and C. Which of the following are correct matches with respect to labelled parts and their description?

 

Look at the given diagram of events during muscle contraction, named as $\mathrm{A},\mathrm{B},\mathrm{C}$. Identify the diagram that shows gradual shortening of length of Sarcomere :-

In the given diagram, which joints are found at the marked sites:

Examine the given diagrammatic view of human skull given below and identify the skull bones labelled from $\mathrm{A}-\mathrm{D}$.