When nadh passes its electrons into the electron transport system, nadh is chemically:
reduced
enzymized
hydrolysed
oxidized

Option D, oxidized

Explanation:

The NADH gets oxidised when it passes its electrons into the Electron Transport System

Oxidization is a process in which one element or compound loses its electron to other chemical element or compound thereby itself getting oxidised and reducing the other one (the one who gains the electron).

Here in the electron transport system, the NADH loses or donates its electron to the Electron Transport System thus chemically it gets oxidized.

Hence, option D is correct

the right side of the picture going down is:

polymerase

protein

transport vesicle

modified protein

the left side of the picture going down is:

dna helix

single-stranded rna

endoplasmic reticulum

ribosome

golgi apparatus

protein released from vesicle

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the answer to your question is:

c. complementary base-pairing