Which verbal is an infinitive?

traveled
traveling
to travel
travel

Which lines from mark antony's speech in julius caesar best illustrate pathos? a. i speak not to disprove what brutus spoke, / but here i am to speak what i do know. b. here under leave of brutus and the rest -/ for brutus is an honourable man; / so are they all, all honourable man. c. and brutus is an honourable man. / you all did see that on the lupercal / i thrice presented him a kingly crown. d. when that the poor have cried, caeser hath wept: / ambition shold have been made of sterner stuff.