In the case of an x-linked recessive disorder, a carrier mother and unaffected father could produce a/an:

The  answer is b since it all happens under ground

Ithink there are some options provide, so plz provide those options also.all the best

1.wear safety goggles when heating or mixing substances 2.tie back long hair when doing experiment in order to prevent from catching fire or dipping into chemicals accidentally 3.keep all exits and passages clear4.wear laboratory coats