I Think its C
Below are the definitions for the words in C
im•pro•vise ĭm′prə-vīz″►
intransitive verb To make, compose, or perform with little or no preparation.
intransitive verb To make or provide from available materials.
intransitive verb To make, compose, or perform something extemporaneously.
More at Wordnik from The American Heritage® Dictionary of the English Language, 5th Edition.
and
pro•di•gious•ly
In a prodigious manner.
Wonderfully; astonishingly; enormously: as, a number prodigiously great.
Excessively; immensely; extremely