Which words in the sentence make up the infinitive phrase?

even though i am too busy right now, i would still like to go to the concert tonight.

a.
to go to the concert tonight

b.
to the concert tonight

c.
too busy

d.
i would still like to go

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the tone of the passage is sympathetic to the forbidden love of romeo and juliet. the nurse plays a significant role in the play. she is responsible for making their meeting again possible. additionally, there is a sense of warning in the choice of words of the nurse. she seems to be authoritative when she calls romeo "scurvy knave", and at the same time the fact that she addresses to him as "sir" reflects respect. the nurse is "vexed", this word describes her confused state of mind. on the one hand, she finds romeo a fine and eloquent man, but on the other, it is thought that man's nature forces men to try to trick women.