Monsoons are one of the most destructive natural phenomena in Asia, but they also limit Africa's trade with the Asian continent, as navigation is severely affected by strong monsoon winds; this affects trade between the two continents, as merchant ships travel from Africa to across the Indian Ocean (which is the monsoon zone), so understanding when and how the winds form will help keep the cargo ships and merchandise, thus increasing trade between Afrika and Asia.
By due process of elimination and the fact that it says at least, the answer is b. this is mainly because at least would have the symbol > only and the fact that 53 and 21 do not add to equal 95. Cheers!