根据下面资料，回答 Everyoneagreesthatinnovationisthekeytosolvingthemanychallengeswefaceasacountryfromhealthcaretoeducationtotheenvironment,andisfundamentaltorestoringeconomicgrowthandprosperity.ButIwouldputitaslightlydifferentway.Wemustfindawaytorebuildthe"innovationinfrastructure"inthiscountry. TheproblemisnotthatAmericansaren′tasinherentlyinnovativeaseverweare.AndthelevelofinterestamongAmericansintheprocessofinnovation--determiningthebestrecipestomakeithappen--hasbeenskyrocketingoverthepastfewyears.Forexample,thenumberoftimestheword"innovation"appearedinGooglenewsstoreshasincreasedbyapproximatelyfivefromObama′sinaugurationtotoday.Googletheterm"innovation"andyou′11get342millionhits,approximatelyhalfthe676millionhitsthat"Obama"generates.Andaccordingtohashtagsorg,innovationistrendingaboutthesamerateasdeficit. Ourproblemisthatthesystemisfailingourcitizens.The"seedcorn"ofinnovation-creativeideas...fundamentalrateitwasbefore.Viable"seedcorn"requiresaninnovationinfrastructureinwhichbrightmindsareprovidedtheresourcesandfreedomtocreateandinventaccordingtotheirpassionsandcuriosities,totakeboldrisks,andeventofail.SuchaninnovationinfrastructurethrivedintheU.S.inthelate20thcenturyasacollaborationthatputAmericansonthemoon,andtothepersonalcomputer,theInternet,andtheeraofgenomicmedicine. Americansarereadyandwillingtoembracethegoalofonceagainleadingtheworldininnovation.Thiscouldbethemoonshotforthenextdecadethatunifiesourcountry.However,weareatatremendousdisadvantageunlesstheinnovationinfrastructureofthiscountryisrebuilt.Thisrequiresanewcollaborationamonggovernment,industryandacademia-onethatissuitedtothechallengesandopportunitiesofthedigitalage,andthatrestorestheboldrisktakingandactionorientationofearliertimes. Accordingtotheauthor,innovationinAmericanhas____________.
A.gone completely lost nowadays B.been weakened gradually C.been taken back in Obama' s day D.come to a turning point正确答案D
