The correct option is B To seeing
Out of the four options, the correct option is B. The infinitive verb is a verb with the word 'to' in front of it. This verb is always just a verb. There is no - ed, no - ing, no - s at the end of the verb. But in the given sentence, 'To' is used as a preposition and 'seeing' is used as gerund. Gerund is a verb form which functions as a noun. Thus, A, C and D options are wrong according to the rule.