|Question 3Verbal

Source Texts

Text
There is no doubt that Irving Langmuir must have proved himself to be extraordinarily        understanding some of the most advanced concepts in the field of chemistry-in 1932 his remarkable talent and hard work was recognized when he was awarded the Nobel Prize in Chemistry for "his discoveries and investigations in surface chemistry."
Which choice completes the text with the most logical and precise word or phrase?
modest about
A
dispassionate in
B
adept at
C
lighthearted about
D