Tho folded layers of the inner membrane in mitochondria is called?

Grana

Matrix

Stroma

Cristae

Idk is is cristae or matrix?

Cristae

Explanation:

Mitochondria are bounded by two lipoprotein membranes similar to other cell membranes. While the outer membrane is smooth, the inner membrane has numerous folded layers - called mitochondrial ridges - that protrude into the interior of the organelle.

The internal cavity of the mitochondria is filled with a fluid called the mitochondrial matrix, where several enzymes are present, in addition to DNA and RNA and small ribosomes and substances necessary for the manufacture of certain proteins.

Cristae is the foled layers of the inner membrane