The wording of these questions make the answers somewhat subjuctive:

#1 The comp. polyglot was edited (the compilation completed) but was not published until after ersasmus’s Nouvm Instrumentum; but erasmus editions are often referred to today as the textus receptus (though not officialy exclaimed as such until the Elzevir brother’s 1633 edition.
#2 well of course ALL of the NT books still exist, which has to do with Preservation and Canonicity…but the question could be referring to the Autograph’s, which obviously NONE of the original autographs are extant.
#3 I would love to see that exact number of MSS as I have read Metzger Jack Moorman give numbers as high as 6,300
#4 “B” or “C” COULD be a correct answer, but he is probably looking for the textual variants found in the handwritten MSS, as opposed to the textual variants found in the editions of the greek texts collated by men such as Beza or Tregelles
# 5 this is the classic example of presumption: as if the critical, eclectic alexandiran scholars are the only scholar of repute”A”) But there are MANY majority text scholars who hold to answer “B” (actually not the majority text which has taken on a whole new connotaion, but the TR scholarship approach such as Dean Burgon)
6. This is misleading as Sinaiticus is not complete in any sense of the word, but does contain the 27 canonical books.
7. should be “BOTH” of the above
8. all of the above and the “family” of MSS designation such as “Caesarian” is completely arbitrary and baseless
9. the answer is D…. and then in the next breath say “the MSS are in general agreement”…and
“there is no real textual differences of any substance” and “No doctrinal variations are found between the texts and MSS’s” …puh lease
10. A-C is the answer as these 3 are found in WH’s writings and none of the three are considered primary over the other 2.