Indeed, men are absolutely indispensable right now, invisible as it is to most feminists, who seem blind to the infrastructure that makes

The complete words for this sentence would be:

 their own work lives possible

This belongs to the article entitled “It’s a Man’s World, and It Always Will Be”, which explains the modern economy of the male and the productivity of women as a whole. 

pretty sure a is right

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer