There were a total of 538 electors in the 2008 election.
Let's see the numbers per state mentioned in the options:
(1) Florida (27) and California (55)
(2) Iowa (7) and Indiana (11)
- we can reject this option, it's worse than (1)
(3) Pennsylvania (21) and Virginia (13)
- we can reject this option, it's worse than (1)
(4) California and Texas
(34)
- this option shares California with option 1) but Texas has more electors than Florida - this is the correct answer!