Which oxygen delivery system most reliably delivers a high (90% or greater) concentration of inspired oxygen to a 7yo child?

The question is incomplete as it does not have the options which are:

A. Face tent with 15 L/min oxygen flow

B. Simple oxygen mask with 15 L/min oxygen flow

C. Nasal cannula with 4 L/min oxygen flow

D. Nonrebreathing face mask with 12 L/min oxygen flow

D) Nonrebreathing face mask with 12 L/min oxygen flow

Explanation:

The non-breathing mask is a mask which supplies a high concentration of oxygen to the patients who are critically ill.

The mask is attached to the oxygen source and the oxygen flow rate is adjusted to the 12l /min. The mask is attached to a reservoir bag where the oxygen gets collected and while using just take care that the oxygen acts as a drug so the rate of oxygen flow should be kept around 12 l/min and the mask should be prescribed by a qualified professional.

In the given question, since the non-breathing face mask is the option which should be provided to the child, therefore, is the correct answer.