Carefully walk through the room. It is possible but tricky to do so damageless, but it is always possible to go back and farm if needed. While in the morph tunnel, simply unmorph to break the bomb blocks overhead.

Requires:

{
  "obstaclesCleared": [
    "D"
  ]
}
"Morph"
{
  "or": [
    "canTrickyJump",
    {
      "acidFrames": 20
    }
  ]
}

Clears obstacles: A