A series of five short lines. The first has an up and a down arrow, and is labeled below 1 s. The second has an up and a down arrow, and is labeled 2 s. The third has an up arrow and no label. The fourth has an up arrow and is labeled 2 p. The fifth has an up arrow and no label.

See explanation

Explanation:

The question is incomplete but I believe that  you are asking about the arrangement of orbitals in an atom.

In response to your question, orbitals are arranged in an atom in accordance with the Aufbau principle. The Aufbau principle states that lower energy orbitals in an atom are first filled before filling the higher energy orbitals. That is, orbitals in an atom are arranged in order of increasing energy levels.

The arrangement of orbitals in the question should be; 1s, 2s, 2p, 3s, 3p. The order of orbitals should be labelled from left to right as shown above.

the answer is definitely c.

b.

the accuracy of the data.