As per 1991 census, sex ratio (females per 1000 males) in India was:

Options

A. 929
B. 941
C. 972
D. 955

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the sex ratio in India as per the 1991 census. The options provided are 929, 941, 972, and 955.

2. **Defining Census**: A census is a systematic process of collecting and analyzing demographic data about a population, including the number of males and females.

3. **Understanding Sex Ratio**: The sex ratio is defined as the number of females per 1000 males in a population. It is calculated using the formula:
\[ \text{Sex Ratio} = \left( \frac{\text{Number of Females}}{\text{Number of Males}} \right) \times 1000 \]

4. **Finding the 1991 Census Data**: According to the 1991 census data, the sex ratio in India was reported to be 927 females per 1000 males.

5. **Choosing the Closest Option**: Since 927 is not among the provided options, we select the closest option, which is 929.

6. **Final Answer**: Therefore, the sex ratio in India as per the 1991 census is 929 females per 1000 males.

### Final Answer:
**929**

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