The top banks are getting ready to roll out a system that gives consumers access to a wide swath of their financial data and allow them to share it instantly.
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Ensure subject-verb agreement when the subject is singular. In this case, "system" is singular, so the verb should be "allows."
"The top banks are getting ready to roll out" is correct.
"A system that gives consumers access to" is also correct.
"A wide swath of their financial data and" is correct.
"Allow them to share it instantly" has an error in subject-verb agreement. The correct form should be "allows them" to maintain agreement with "system" (singular).
Thus, the error is in option (4), where "allow" should be corrected to "allows."