The questions below refer to the Fe-Fe3C phase diagram below. Composition (at%C) 10 15 20 25 5 0 1600 1538C 1493C L 1400 2500 1394C Y+L 1200 1147C 2.14 4.30 2000 7. Austenite Temperature (C) Temperature (F) 1000 912C y+Fezc 1500 800 G 727C 0.76 600 0.022 a, Ferrite a + Fec Cementite (Fec) 1000 400 0 2 4 5 6 6,70 (Fe) Composition (wt% c) Adapted from Binary Alloy Phase Diagrams, Vol 1, 2nd edition, T. B. Massalski (Editor-in-Chiet), 1990. Reprinted by permission of ASM International Materials Park, OH For an alloy with a composition of 1.5 wt% C at 800C. A. For this alloy, phase(s) present is [Select] B. In this course, the chemical composition(s) of the phase(s) present is represented by [Select) C. The unit of the chemical composition(s) of the phase(s) present is [ Select For an alloy with a composition of 1.5 wt% C at 800C. A. For this alloy, phase(s) present is [Select ] B. In this course, the chemical composition(s) of the phase(s) present is represented by [Select ] [ ) C. The unit of the chemical composition(s) of the phase(s) present is [ Select ] D. The mass fraction(s) of the phase(s) present Select]