The answer should be A. This is because the other sentences don't need any word except for the first word in its sentence.
In the answer choice A, partners in Water partners should be capitalized because it is an organization. Therefore the sentence should be...
"<span>It was started in 2009 by actor Matt Damon and Gary White, the co-founder of Water Partners."</span>
Answer:
It means to be very good at something
" thoroughly proficient : EXPERT" - Merriam Webster
When people are traveling on a road or on a highway,
travelers can always expect to see information about the road on which they are
traveling such as curves in the road, speed limits, speed suggestions,
road/highway names, etc. Signage works
well in most conditions; however, for some road situations special caution is
taken to help ensure information will not be missed by travelers. As an
extra step/precaution, white painted letters and symbols are placed on the
surface of the roadway; this measure helps prevent what would could potentially
be a dangerous/deadly situation.