Need some help answering these questions, tool used is Circuit Construction kit: DC - Virtual Lab (Phet Labs)

C. Predict the relative brightness of the bulbs B. Ba. and Ba in the circuits shown. ( A cashed box has been drawn around the network of circuit elements that is in series with each of these bulbs.) What does your prediction imply about the relative currents through the batteries? Explain. Have a tutorial instructor show you these circuits so that you can check your answers. Resolve any conflicts between your answers and your observations. I1. Potential Difference For the remaining circuits in this tutorial use the battery holder with two batteries connected in series. The two-battery combination will be treated as a single circuit element. A. Set up the circuit with a single bulb and the battery combination as shown. Connect each probe of the voltmeter to a different terminal of the battery holder to measure the potential difference across the battery. Make a similar potential difference measurement across the bulb. How does the potential difference across the bulb compare to the potential difference across the battery? VBut B. Set up the circuit containing two bulbs in series as shown. Rank from largest to smallest the currents through bulb 1 and bulb 2, and the bulb in the single-bulb circuit from part A (/Bulb 1, /Bulb 2, and /single). Explain