The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Simpson (1961) has defined systematics as the branch of biology that
deals with the diversity of organism at every level of classification.
It deals with cataloguing plants, animals and other organisms into
categories that can be named, remembered, compared and studied. Study of
only one organism of a group provides sufficient information about the
remaining members of that group. It also helps in developing
evolutionary relationships with or without the help of taxonomic studies
of fossils. So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.