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Please look at the following sentence.

"Every means _____ will be used to ensure that your valuables are delivered quickly and safely"
(A) possibility (B) possible (C) possibilities (D) possibly

The correct answer is (B)possible. I couldn't understand why (A) possibility can't be the other correct answer.
Since there is no article after "means", can't (A) possibility be the other right answer?
I've looked for the word "possibility" in my dictionary. It says I can use for both of a singular and a plural noun.

Thank you for your answer in advance.
Comments  
Son James Please look at the following sentence. "Every means ___ will be used to ensure that your valuables are delivered quickly and safely" (A) possibility (B) possible (C) possibilities (D) possibly The correct answer is (B)possible. I couldn't understand why (A) possibility can't be the other correct answer. Since there is no article after "means", can't (A) possibility be the other right answer?I've looked for the word "possibility" in my dictionary. It says I can use for both of a singular and a plural noun. Thank you for your answer in advance.
Every means (that is) possible will be used... If you add 'that is' it is clear that 'possibility' cannot be used.
Ah~ Did you mean "means" is not a verb, but is a noun? Thank you for your confirmation in advance.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Son JamesAh~ Did you mean "means" is not a verb, but is a noun? Thank you for your confirmation in advance.
Yes, 'means' is a noun, as it is used.