If retro means "back” and spec means "to see or look,” what is the best definition of the phrase in retrospect in the sentence below? in retrospect, i probably should have taken better notes on that topic. in regretting the past in respecting the past in anticipating the past in considering the past

In considering the past is the best option

Step-by-step explanation:

Given that in a certain terminology, retro means back and spec means to see or to look

Hence together retrospect means, to see or look back, which is matching with the phrase in considering the past

Here considering is equivalent to see or look and back means the past

Other options are wrong because

regret does not mean equally as to see or look,

respect does not mean equally as to see or look,

anticipating also does not mean equally to see or to look

So only option 4 is right