Correct option is C
Star Shakes:- Star shake are radial splits or cracks wide at circumference and diminishing towards the centre of the tree. This defect may arise from server frost and fierce heat of sun.
Cup Shake:- Cup shake appears as carved split which partly or wholly separates annual rings from one another. It is caused due to excessive frost action on the sap present in the tree, especially when the tree is young.
Ring Shake:- When cup shakes cover the entire, ring they are known as ring shakes.
Heart shake:- Heart shake occurs due to shrinkage of heart wood, when tree is over matured. Cracks starts from pith and run towards sap wood.
