If plants save water but are not salt-tolerant, where will they not succeed?

Correct answer: In saline marshy coastal area

The direct answer is A, the saline marshy coastal area. Plants that save water are suited to dry conditions, but salt-sensitive plants cannot tolerate high salt in soil or water. Saline marshes near coasts contain salty water and soil, so successful plants there need special salt tolerance, such as mangrove adaptations. Option A is correct because it combines two stresses: waterlogging and salinity, and the stated plants cannot tolerate salt. Option B, a dry desert, may be suitable for water-saving plants if they can survive its heat and dryness. Option C, a low-rainfall plateau, can also favour plants that conserve water, provided other conditions are suitable. Option D, sandy land, may drain quickly and often favours water-conserving plants; it is not necessarily salty. The key is to match the adaptation with the habitat. Memory cue: no salt tolerance means no saline marsh.