Final answer:
Conceptual word pairs are typically acquired 2) asymmetrically with the positive member first due to positivity bias, reflecting cognitive development and the prevalence of positive experiences in early learning.
Step-by-step explanation:
Conceptual word pairs like "deep-shallow" are typically learned in an asymmetrical fashion, with the positive member often acquired first. This is known as the positivity bias. In the field of cognitive psychology, many studies suggest that when learning antonyms, there is a tendency for positive terms to be learned and used before their negative counterparts. The word that conveys the more favorable or less complex concept – in this case, 'deep' – is usually processed more easily and remembered better.
Considering the options provided, the most accurate answer to how conceptual word-pairs are acquired would be "asymmetrically with the positive member first". This reflects early cognitive development, where positive experiences and associations are usually more prevalent than negative ones. Thus, words with positive connotations or simpler, more common uses are often ingrained in our vocabulary sooner than their negative or less common opposites.