You should not use context clues when: select all that apply.

a. a word appears frequently

b. you really need an exact meaning

c. your understanding of a whole passage depends on that word's meaning

d. you feel unsure of your guess

surrounding words are also unfamiliar

Option D and E

Explanation:

Context clues are basically used to provide a hint with in the sentence to identify a word. Basically , the surrounding information is used to identify the relevant word. It is an essential tool to analyse and comprehend word, also it determines the  word pronunciation and meaning. These clues may either be given in the same  sentence or the next sentence.

Hence, wherever there is an uncertainty or confusion context clues should not be used as it may misguide the reader.

Hence, option D and E are correct

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.