Which Liquid object would provide details on the items currently in a cart?

The correct choice is based on the understanding of Liquid objects in Shopify. The 'cart' object is specifically designed to encapsulate all the details concerning the items that a customer has currently added to their shopping cart. It provides accessible information such as the total number of items, the subtotal, and which products are included along with their quantities.

The 'cart' object serves as a comprehensive source of information that can be crucial for any theme development, such as dynamically displaying cart details or calculating totals. It allows developers to manipulate and present cart content in a user-friendly manner.

In contrast, other options like 'cart_item' and 'line_item' do not represent the entire cart but rather specific elements related to cart contents. 'product' refers to individual products available in the store rather than items specific to the cart context, making it unsuitable for detailing current cart items. Therefore, the 'cart' object is the most appropriate choice for acquiring information about the items currently in the cart.