When the topic and therefore the object of the verb is that the same person or thing, we use a personal pronoun. When reflexive pronouns are wont to put emphasis on a selected noun, they're called emphatic pronouns.
The emphasizing pronoun for singular first-person 'I' is 'myself'. this means that the primary blank must be ‘myself’. Therefore, by itself, we are able to eliminate options ‘b’ and ‘c’ as incorrect.
Now, the reflexive for a singular person relies on the gender of the noun like - ‘himself’, 'herself' or 'itself'.
For the given sentence the noun may be a male. So, the reflexive that must be used must be 'himself'.
Thus, this suggests that the choice – ‘option a’ is that the correct answer. Since ourselves is that the reflexive for the plural person, option‘d’ is additionally incorrect.