To find out how much the customer would have to pay for the pair of jeans and two shirts, we need to calculate the discount on each item and then subtract that discount from the marked price.

Let's start with the pair of jeans, which is marked at Rs 1450.

**Calculating the discount on the jeans:**
The shop is offering a discount of 10% on all items. To find out the discount on the jeans, we need to calculate 10% of Rs 1450.

Discount on jeans = 10% of Rs 1450
= (10/100) * 1450
= 0.10 * 1450
= Rs 145

Now, let's subtract this discount from the marked price of the jeans to find out how much the customer would have to pay for the jeans.

Price of jeans after discount = Marked price of jeans - Discount on jeans
= Rs 1450 - Rs 145
= Rs 1305

So, the customer would have to pay Rs 1305 for the pair of jeans.

**Calculating the discount on the shirts:**
Each shirt is marked at Rs 850, and the shop is offering a discount of 10% on all items. To find out the discount on each shirt, we need to calculate 10% of Rs 850.

Discount on each shirt = 10% of Rs 850
= (10/100) * 850
= 0.10 * 850
= Rs 85

Now, let's subtract this discount from the marked price of each shirt to find out how much the customer would have to pay for each shirt.

Price of each shirt after discount = Marked price of each shirt - Discount on each shirt
= Rs 850 - Rs 85
= Rs 765

Since the customer is buying two shirts, the total price for both shirts would be Rs 765 * 2 = Rs 1530.

**Calculating the total amount to be paid:**
To find out the total amount the customer would have to pay, we need to add the price of the jeans and the total price of the shirts.

Total amount to be paid = Price of jeans + Total price of shirts
= Rs 1305 + Rs 1530
= Rs 2835

Therefore, the customer would have to pay Rs 2835 for the pair of jeans and two shirts.

Hence, the correct option is (a) Rs 2835.

Correct answer is option "A", Rs 2,835