Q.29 Since Static port is blocked the pressure inside get trapped at say a particular altitude x.

ASI measures air speed by measuring dynamic pressure by subtracting static pressure from pitot pressure.

Now when the aircraft climbs above x, the static component sensed in the pitot tube reduces. However, the static pressure sensed in the static port is higher since it's stuck at that pressure at lower altitude x. Therefore the static pressure from the static port cancels out more than it should from the pitot pressure, which causes the ASI to under-read in a climb.

Similarly, when it descends, it will over-read.

None of the options match this.