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Consider beta$-$oxidation of C$18$:$2$ cis$\backslash$Delta $9,12$ and the specific round of beta$-$oxidation that encounters the substrate C$10$:$1$ cis$\backslash$Delta $4.$ C$10$:$1-$cis$\backslash$Delta $4$ will initially undergo an oxidation step followed by a reduction step that produces this particular product.

A$.$

C$10$:$1$ trans$-\backslash$Delta $2$

B$.$

C$10$:$1$ cis$-\backslash$Delta $3$

C$.$

C$10$:$1$ trans$-\backslash$Delta $3$

D$.$

NADPH

E$.$

C$10$:$1$ cis$-\backslash$Delta $2$