Explanation:

- Option 1: off

- Incorrect in this context. "Off" suggests separation or removal, which doesn't fit when discussing lists or groups.

- Option 2: of

- Implies belonging or relation. But here it doesn’t appropriately convey the action or category regarding the MLAs who switched allegiance.

- Option 3: with

- Indicates accompaniment or association. Would suggest inclusion or partnership with the group, fitting well here.

- Option 4: out

- Typically suggests exclusion or outside of something. Not relevant in this context about those included in the switch.

- Correct Answer: Option 3 - with

- It clearly indicates that Thounaojam Shyamkumar was among the group of eight MLAs who changed allegiance.