Explanation

Khosla's theory states that the exit gradient is primarily dependent on the ratio of the length of the impervious floor to the depth of the sheet pile (L/d), but in simplified multiple-choice contexts for this specific exam pattern, 'width/depth ratio' or similar geometric ratios are often cited as the key dependency factor influencing seepage pressure and gradient. However, strictly speaking, Khosla's theory defines exit gradient based on L/d (length/depth). Let me re-evaluate. Actually, standard textbooks state that the exit gradient depends upon the ratio of length to depth (L/d). Option C is Length/depth ratio. Wait, let's check standard MCQs for this. Many sources say 'ratio of length to depth'. But some simplified versions might use width/depth if it's a specific case. Let's look at the options again. A: width/depth, B: depth/width, C: Length/depth, D: depth/Length. The standard answer is usually Length/depth ratio (L/d). If the current answer is A, it might be incorrect. I should suggest C. But wait, sometimes 'width' refers to the length of the floor in specific contexts? No, length is L. I will suggest C as likely correct based on standard theory, but since this is a specific exam pattern, I need to be careful. Actually, many online MCQ banks for this exact question list 'ratio of length to depth' as the answer. So A is likely wrong. I will set suggestedCorrectAnswer to C.