Which words in the sentence are the complete infinitive phrase?

it can be quite difficult to recover from major surgery.

a.
quite difficult

b.
it can be

c.
to recover

d.
to recover from major surgery

The answer is D because u have the infinitive verb to recover.

Dr.king , i would take my mental flight by egypt and i would watch god’s children in their magnificent trek from the dark dungeons of egypt through, or rather across the red sea, through the wilderness on toward the promised land.his  speech"i  have a dream" to encourage people that change will come. this  speech  was very important during the civil rights movement and was a contributing factor in the end of racial injustice in society. the  intended audience  of "i  have a dream" is white people. i hope this