Requirements are: "A level typical offer A*AA plus at least grade 7 or grade A in GCSE Mathematics.
A level additional information You will also need grade 6/B in GCSE English Language. Applicants with grade 6/B in GCSE English Literature and minimum grade 4/C in GCSE English Language may also be considered."
In other words, you need A Levels in any subjects so long you get A*AA. You would also need to check that your GCSEs meet the grade requirements.
Whilst they did not specify, I would also favour the more traditional and academic subjects where possible (you can check on this to be sure).
If you're not particularly sure, it's wise to contact the undergrad admissons staff at their Social Science department (not general undergrad admissions). This should be Susanna Jackman, even though the admin staff all have the same email address. See: https://warwick.ac.uk/fac/soc/ppe/about/contacts/