In a case involving the alleged murder of B by A, which of the following facts are relevant under Section 7 of Indian Evidence Act?

Section 7: Facts which are the occasion, cause or effect of facts in issue –– Facts which are the occasion, cause or effect, immediate or otherwise, of relevant facts, or facts in issue, or which constitute the state of things under which they happened, or which afforded an opportunity for their occurrence or transaction, are relevant. Illustrations. (a) The question is, whether A murdered B. Marks on the ground, produced by a struggle at or near the place where the murder was committed, are relevant facts.