Think of bench terrace design the way an engineer would draw it on paper before construction starts. Three choices must be fixed before touching the ground: what type of terrace to build, how far apart (vertically) the terraces should be, and what cross sectional shape and size each terrace strip and riser will have.
Type of terrace decides the overall strategy (level terrace, graded terrace, or narrow orchard terrace). Spacing decides how many terraces are needed down the slope and how wide each strip will be. Cross section decides the actual earthwork, the cut, the fill, and the riser slope, which is what makes the terrace stand safely.
Length and alignment come next, but they are adjusted to match the shape of the field and the property boundary on site, they are not computed the same way spacing and cross section are, so they sit outside the strict design step described in the question.
That leaves type, spacing and cross section, statements (A), (B) and (C), as the answer.
\[\boxed{\text{Option 1: (A), (B) and (C) only}}\]