how to let the options arrays to be horizontal?

Here is my view , and i want to make all the options to be horizontal, can someone help me do this?

here is my code:

echo $this->Form->input('field', array(

'before' => '--before--',

'after' => '--after--',

'separator' => null,

'options' => array('1', '2', '3', '4'),

'type' => 'radio'

));

thanks a lot!

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