1. The word fascimile means to make alike; copy (C).
The word comes from two Latin words: facere meaning to make and -simile meaning similar or like. A fax machine is called a fax machine because it makes fascimiles.
2. The word distend means to strech apart or swell (C).
The Latin prefix dis- means "apart." The Latin root tendere means to strech, extend, or spread.
3. The history and origin of words is known as etymology (A).
Don't confuse this with entomology, which is the study of insects.
4. The word that means "not foreseeing" is improvise (D).
You improvise when you do something without any preparation or when you make something with whatever is available. You do not foresee what you might need to do or make.