The correct option is C Cytochrome C
Cytochrome C is an essential heam containing protein in the ETC. Cytochrome C transfers electrons from complex III to complex IV in ETC.
Myoglobin is a heam containing oxygen-binding protein found in the muscle tissue of vertebrates.It is the primary oxygen-carrying pigment of muscle tissues.
Phytochrome is a pigment that plants, and some bacteria and fungi, use to detect light.
Chlorophyll is the green pigment found in plants and is essential for photosynthesis.