The conjunction has used in the above given sentence is “that”. This is linkimng two sentences such as the college (object), that (conjunction) he (subject) chose (verb) is in NewYork.
The other words are adjectives such as who, what and which. These words do not fit into the sentences correctly.
Thus, the options (d), (c) and (a) are incorrect.
The conjunction has used in the above given sentence is “that”. This is linkimng two sentences such as the college (object), that (conjunction) he (subject) chose (verb) is in NewYork.
Therefore, the correct option is – b. that.