Performance Tuning :: How To Determine Slowness In I/O From AWR

We are investigating performance of SQL executions on a database server and we suspect I/O on the server is an issue

For example one particular statement accesses one row during execution (index access) and still takes 2.4 seconds out of which it does I/O for 1.9 seconds

which of the following sections in the AWR will give us the correct information about the I/O, it is slow or not?

1)
Load Profile
Logical reads per second
Physical reads per second

2)
Top 5 Timed Foreground Events
waits / time(s) for events like "db file sequential/scattered read"
average wait(ms) for events like "db file sequential/scattered read"

3)
Foreground Wait Events
db file sequential read
db file scattered read

4)
Wait Event Histogram
%of waits <1ms <2ms
Disk file operations I/O
db file sequential read
db file scattered read

5)
Wait Event Histogram Detail (64 msec to 2 sec)
Wait Event Histogram Detail (4 sec to 2 min)

6)
IOStat by Function summary
Buffer Cache Readsreads per sec

7)
File IO Stats