When the subject and the object of the verb is the same person or thing, we use a reflexive pronoun. When reflexive pronouns are used to put emphasis on a particular noun, they are called emphatic pronouns.
The reflexive pronoun for singular first person 'I' is 'myself'. Thus the first blank must be 'myself'.
We can thus eliminate options A and D as incorrect answers.
The subject and object of the second sentence is also 'I'. So, the correct answer will be 'myself'.
Thus option B is the correct answer.
'Ourselves' is the reflexive pronoun for the plural first person. Thus option C is also incorrect.