Explanation

A is correct because Sana Mir was the top-ranked ODI bowler in October 2018. B is incorrect because Jess Jonassen was not the top-ranked bowler at that time. C is incorrect because Marizanne Kapp did not hold the top ranking for ODI bowlers in October 2018. D is incorrect because Megan Schutt was not the top-ranked bowler in October 2018.