Eloquent WhereHas With Several Nested Wheres from Array - php

Question

I have a database with tables: questions, answers, responses, and respondents. Questions have answers, which have responses, which are owned by a respondent (Respondents can have many responses).
I'm trying to make correlations by zeroing in on all the responses to questions related through respondents who chose a certain answer to a question. So, what else did people who answered that they were 18 - 20, answer.
The trick is I want to do this across multiple respondents and multiple answers. For example, what else did people who are 18 - 20, and like the color green like:
I currently have this working in an "or" fashion where each additional answer_id I add pulls in respondents who chose either one of the two answers:
$cFilters = array() of answer_ids;
$respondents = Auth::user()->account->respondents()
->whereHas('responses', function($q) use($cFilters) {
$q->whereIn('responses.answer_id', $cFilters);
})->get();
I'd ultimately like to have them working in an "and" fashion where adding in another answer_id shows only respondents who have chosen both answers identified by the answer_ids, can't quite figure that one out. Here is what I've tried so far that doesn't raise errors, but also doesn't seem to work correctly:
$cFilters = array() of answer_ids;
$respondents = Auth::user()->account->respondents()
->whereHas('responses', function($q) use($cFilters) {
foreach($cFilters as $answer_id) {
$q->where('responses.answer_id', $answer_id);
}
})->get();

Answer 1

I've had to resort to raw SQL, but it works:
$query = 'SELECT * FROM respondents
WHERE id IN ( ';
$i = 1;
foreach($cFilters as $answer_id) {
$query = $query . 'SELECT respondent_id FROM responses WHERE answer_id=' . $answer_id;
if($i < count($cFilters)) {
$query = $query . ') AND id IN (';
}
$i++;
}
$query = $query . ')';
$respondents = DB::select( DB::raw($query) );