Invective is basically a word that means a curse or a cursing. A good example is " A Modest Proposal" written by Swift. It is actually a satirical writing that recommends the Irish babies to be of high nutritional value and should be consumed as a healthy food. I hope the answer comes to your help.
Choice (a) is correct. Today, Coleman is already an aviatrix where she was able to reach that because of help from people including Abbott. He advised the lady way back past years to take gradual steps to reach her goal. Since Coleman is just a nobody and does not have enough money, so Abbott gave her money to sustain her education continually.
I would go with - D. imaginative
Frequently means often.
I hope this helps.
