Teachings A. Yogah karmasu kaushalam (Skill in action is yoga) and C. Samatvam yog uchyate (Equanimity is yoga) are prominent verses from the Bhagavadgeeta.
Conversely, B. Yogashchittivrittinirodhah (Yoga is the cessation of mental fluctuations) originates from the Yoga Sutras of Patanjali, and D. Yogah samadhih (Yoga is a state of absorption) is derived from texts other than the Bhagavadgeeta.
Thus, statements B and D are not found within the Bhagavadgeeta.