JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="pt-br">
  <head>
    <title>Front End Test - Greenthumb</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link
      href="https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700&display=swap"
      rel="stylesheet"
    />
    <link rel="stylesheet" href="./index.scss" />
  </head>

  <body>
    <select id="sunlight"></select>
    <select id="water"></select>
    <div id="items"></div>
    <script
      type="text/javascript"
      src="//ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"
    ></script>
    <script src="index.js"></script>
  </body>
</html>

JavaScript

const url = 'https://front-br-challenges.web.app/api/v2/green-thumb/?sun=high&water=regularly&pets=false';

let selectedSun, selectedWater, globalData = [];

let sunlight = $('#sunlight');
sunlight.empty();
sunlight.append('<option selected="true" disabled>Choose sunlight</option>');
sunlight.prop('selectedIndex', 0);

let water = $('#water');
water.empty();
water.append('<option selected="true" disabled>Choose water</option>');
water.prop('selectedIndex', 0);

sunlight.on('change', function() {
  selectedSun = this.value;
  showImages();
});

water.on('change', function() {
  selectedWater = this.value;
  showImages();
});

const showImages = () => {
	$("#items").empty();
  globalData.forEach(item => {
  if (!selectedWater || (selectedWater && item.water === selectedWater) && 
  (!selectedSun || (selectedSun && item.sun === selectedSun))) {
      let img = document.createElement('img');
      img.src = item.url;
      $("#items").append(img);
    }
  })

}

$.getJSON(url, function (data) {

    console.log(data);
    globalData = data;
    
    const sunlights = data.reduce((acc, curr) => {
    	if (!acc.includes(curr.sun)) acc.push(curr.sun)
      return acc;
    }, []);
    
    const waterTypes = data.reduce((acc, curr) => {
    	if (!acc.includes(curr.water)) acc.push(curr.water)
      return acc;
    }, []);
  
    $.each(sunlights, function (key, entry) {

      sunlight.append($('<option></option>')
          .attr('value', entry)
        .text(entry));

    })
  
    $.each(waterTypes, function (key, entry) {
  
      water.append($('<option></option>')
        .attr('value', entry)
      .text(entry));

  })
  

});