sendPoll中带有'option'数组的电报bot问题

I don't know how to get working the code, probably i have an error writting the 'options' array. Code attached. I use the same elseif for "sendMessage" and works perfect. Thanks!

https://core.telegram.org/bots/api#sendpoll

'options' => array('A','B','C'),

This is not working too

'options' => [ "A", "B", "C" ]

elseif (strpos($text, "/poll") === 0) {

    $parameters2 = array(
        'chat_id' => $chatId,
        'options' => array('A','B','C'),
        'question' => "Select correct one",

    );

    sendButton('sendPoll', $parameters);

}

You can try this below code

'options' => json_encode(array('A','B','C')),

in place of

 'options' => array('A','B','C'),