【单选题】
在标记中，用于设置页面标题的是（）
</p><p><span>B、 </span><caption> </p><p><span>C、 </span><head> </p><p><span>D、 </span><html> </p><br /></div>
<div style="background-color: #F5F5F5;line-height: 40px;"> 题目答案</div>
<div style="padding: 15px;"><img style="width: 100%;max-width: 300px;" src="data:image/png;base64,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"></div>
<div style="background-color: #F5F5F5;line-height: 40px;"> 答案解析</div>
<div style="padding: 15px;"><br />略<br /><br /></div>
</main>
<div style="color: #999999;font-size: 12px;text-align: center;">
<div style="width: 100%;height: 20px;border-top: 1px solid #F3F3F3;margin-top: 0px;"></div>
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</div>
<input id="select_key" style="display: none;" placeholder=" 必须存在此代码，否则激励视频可能不会生效..." />
<script>
// 页面跳转
function open_nativepage(page_url, form_txt){
// 调用封装好的方法跳转原生页面 jumpToPage(原生页面路径，传给原生页面的参数)
jumpToPage(page_url, form_txt);
}
// 发起查询激励视频结果请求，GET方法
function start_fetchData(search_key, search_delay){
}
</script>
</body>
</html>
在标记中，用于设置页面标题的是（）
A、