The sentence, in Text I, in which the boldfaced expression introduces...

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The sentence, in Text I, in which the boldfaced expression introduces an idea of addition is

a) “Although far fewer women work in the oil and gas (O&G) industry compared to men, many women find rewarding careers in the industry.” (lines 1-3)
b) “I chose the oil and gas industry because of the challenging projects,” (lines 17-18)
c) “Even though my Master’s thesis was more geared toward environmental studies,” (lines 31-32)
d) “as well as other business relationships abroad.” (lines 76-77)
e) “but there are times when I get calls at night or on weekends from a rig or other geologists for assistance with a technical problem.” (lines 91-94)