17.
The answer is: A
Explanation
The correct option is A: S.7.
According to section 7 of the Indian Evidence Act, 1872, 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.
In this case, the marks on the ground produced by a struggle are relevant facts as they are the effect of the murder of B by A, or the fact in issue. They also constitute the state of things under which the murder happened, and afford an opportunity for its occurrence. Therefore, they fall under section 7 of the Act.