Are these correct?

1- The mystery surrounding virus is how exactly it............... its recent rapid spread into areas where it....................... before.

A- had accomplished / hasn't been detected

B - will accomplish / wouldn't be detected

C- accomplishes / wasn't detected

D- has accomplished / hadn't been detected

E- accomplished / isn't detected

My answer is C.

2- After a flood alert due to the rising levels of the River Seine, 250.000 artworks............... out of the Louvre Museum's basement storage rooms which.................

A- had to be moved / would have been flooded

B- may have been moved / could be flooded

C- ought to be moved / must have been flooded

D- must have been moved / might be flooded

E- used to be moved / would be flooded

My answer is A.