"Martin Luther King Jr$..$ split$()$ splits the string literal "Martin Luther King Jr$."$ using any whitespace character as the default separator and returns the list of tokens

$[$Martin Luther', 'King Jr$.\text{'}]$

$[\text{'}$Martin$\text{'},\text{'},$ 'Luther', $\text{'}\text{'}$ 'King', $\text{'}\text{'}$ Jr$.]$

$[$Martin Luther,$\text{'}$ 'King', $\text{'}$Jr$.]$

none of these

$[$Martin$\text{'},$ Luther, 'King', $\text{'}$Jr$.]$