Seed oils are often dehydrogenated and added back into processed foods as partly unsaturated fatty acids. In comparison with the original oil, the new fatty acids have additional double carbon–carbon bonds, replacing what were once single bonds. This process could also be described as _____________.
(a) isomerization
(b) oxidation
(c) reduction
(d) protonation

I looked up and was able to eliminate a and d, I don't think it's oxidation, so would it be reduction?
I know that isomerization = same atoms, different order, and protonation is a type of catalyst that speeds up a reaction
but I'm still not sure which is the correct answer.
Can someone explain. Much appreciated.

Question

Seed oils are often dehydrogenated and added back into processed foods as partly unsaturated fatty acids. In comparison with the original oil, the new fatty acids have additional double carbon–carbon bonds, replacing what were once single bonds. This process could also be described as _____________.
(a)	isomerization
(b)	oxidation
(c)	reduction
(d)	protonation

I looked up and was able to eliminate a and d, I don't think it's oxidation, so would it be reduction? 
I know that  isomerization = same atoms, different order, and protonation is a type of catalyst that speeds up a reaction
but I'm still not sure which is the correct answer.
 Can someone explain. Much appreciated.

aaronq · Answer

it is in fact reduction. reduction - formally - means an acceptance of electron(s) by an atom, in fact reducing the oxidation state (towards a more positive side). In biological terms, it means adding H's (or more accurately, hydrides $H^-$).

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