Which of the Choices Correctly Represents the Synthesis of DTTP $\to$

Which of the choices correctly represents the synthesis of dTTP as represented by the following reactions?
(I) dUMP + N⁵,N¹⁰-methylenetetrahydrofolate $\to$ dTMP + dihydrofolate
(II) dTMP + ATP $\to$ dTTP + P_i
(III) dUTP + H₂O $\to$ dUMP + PP_i
(IV) dUTP + N⁵,N¹⁰-methylenetetrahydrofolate $\to$ dTTP + dihydrofolate

A) I $\to$ II $\to$ IV
B) IV only
C) III $\to$ IV $\to$ I $\to$ II
D) III $\to$ I $\to$ II
E) III $\to$ I