Toeic vocabulary question: Warrant/ensure

Hello there,

There is a TOEIC question whose answer was quite obvious for me at the first sight, however after discussing with others who had chosen a different answer (which was by the way not the right answer) made me think that their answer could also work.
Could « warrant » work in this context?
Thanks in advance for your help
Here below the question:
we are reviewing the packaging procedures for our products and are looking to add more steps to… that the products are packaged securely and delivered without damage.
B) affect
C) ensure ( my answer)
D) warrant (answer chosen by some)


The verb ‘warrant’ can’t be a followed by a clause, it’s always followed by an object.

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Thanks for your help!
It was one of the explanation that I thought without knowing the rule.
Have a nice weekend