How will mining affect the rock layers

Can someone me with this plz? ! i'm putting 20 points on it!

Which of the following events did not occur as a result of china’s open-door policy? a. trade between japan and china was encouraged. b. all countries were given equal access to chinese ports. c. foreign influence in china increased. d. the influence of the communist party weakened.

Which was not a country that massively built up its navy in the early 1900s? germany china united statesbritain