The correct answer is A. -ate
Step-by-step explanation:
In grammar, verbs and nouns are two different types of elements, verbs are words that describe actions or states while nouns refer to entities such as places, people or things. Additionally, nouns can be formed by adding suffixes to verbs or modifying parts of the word, for example, the word "explode" that is a verb or action can become a noun by adding "-sion" as "explosion".
In the case of the suffix "-tion" this is used to form nouns mainly if the verb ends in -ate, this includes verbs such as "create" that leads to "creation", "educate" that leads to "education" or "locate" that leads to "location". Thus, the ending -tion creates the noun form of many verbs ending in -ate.